Peach Pecan Overnight French Toast Casserole

Make Peach Pecan Overnight French Toast Casserole with gluten-free ingredients, a crispy pecan streusel topping, step-by-step instructions, and tips for a perfectly set custard every time.

I almost didn’t serve this at Easter brunch two years ago. I’d assembled the casserole the night before, gone to bed feeling confident, and woken up convinced I’d used too much custard. The bread looked absolutely submerged. My gluten-free peach pecan overnight french toast had been sitting in what looked like a bowl of eggs and milk—not a brunch dish.

I baked it anyway, mostly out of stubbornness. Fifty minutes later I pulled out a golden, puffed casserole with a crisp pecan streusel top and a custardy center that cut into clean squares. My family cleaned the entire 9×13 dish and asked if I had more.

What makes an overnight french toast casserole work where so many fail? It comes down to the bread, the soak time, and that streusel—three things that are completely within your control, even without gluten.

Why You’ll Love This Gluten-Free Peach Pecan Overnight French Toast

• True overnight convenience — all the hands-on work happens the night before, so morning means just adding streusel, sliding it into the oven, and pouring coffee.
• Rich, custardy interior with a crisp top — the custard ratio of eggs, whole milk, and heavy cream creates a center as silky as bread pudding, while the pecan streusel bakes into a crunchy, caramelized topping.
• Naturally adaptable — swap the heavy cream for coconut cream and the milk for oat milk for a fully dairy-free version that bakes up just as well.
• Designed to feed a crowd — eight generous servings from one dish, with minimal morning effort, makes this the make-ahead brunch recipe that earns its place every time guests are coming.

The Secret to Perfect Gluten-Free Peach Pecan Overnight French Toast

• Use certified gluten-free brioche or enriched sandwich bread. Gluten-free brioche is enriched with eggs and butter, which means it absorbs custard without falling apart overnight. Leaner gluten-free sandwich breads can turn mushy—the fat content in brioche protects the structure through the long soak. The trusted celiac baking guidance at Beyond Celiac reinforces why fat content in gluten-free breads matters so much for structure.
• Layer the peaches between the bread, not just on top. Peaches release juice as they bake. Tucking half of them into the middle layer means that juice soaks upward into the bread from below rather than pooling on the surface and making the top soggy.
• Press the bread into the custard before refrigerating. Gluten-free bread is denser than conventional bread and won’t absorb liquid passively the way wheat bread does. A firm press with a spatula or your hands ensures full contact between the custard and every cube before the overnight soak begins.
• Add the streusel in the morning, not the night before. Oats and almond flour absorb moisture aggressively. A streusel added the night before will be saturated and soft by morning—add it cold, directly from the fridge mixture, right before the dish goes into the oven.

Ingredients

For the French Toast Casserole

Ingredient	Amount	Notes
Certified gluten-free brioche or sandwich bread, cut into 1-inch cubes	1 loaf (14–16 ounces)	Day-old bread absorbs custard better than fresh
Ripe peaches, peeled and diced	3	Frozen peaches (thawed and drained) work off-season
Chopped pecans	½ cup	Toasted pecans add deeper flavor
Large eggs	8	Room temperature blends more smoothly
Whole milk (or milk of choice)	2 cups	Full-fat dairy gives the richest custard
Heavy cream	½ cup	Adds silkiness; sub coconut cream for dairy-free
Pure maple syrup	⅓ cup	Adds natural sweetness to the custard base
Vanilla extract	2 teaspoons	Pure vanilla, not imitation
Ground cinnamon	1½ teaspoons	Blooms in the warm custard for fuller flavor
Ground nutmeg	¼ teaspoon	Freshly grated is noticeably more fragrant
Salt	¼ teaspoon	Balances the sweetness of the maple syrup

For the Pecan Streusel Topping

Ingredient	Amount	Notes
Certified gluten-free rolled oats	½ cup	Must be certified GF—oat cross-contamination is common
Almond flour	⅓ cup	Blanched almond flour, not almond meal
Chopped pecans	⅓ cup	Finely chopped for even streusel coverage
Brown sugar	¼ cup	Packed; light or dark both work
Ground cinnamon	½ teaspoon	Complements the cinnamon in the custard
Cold unsalted butter, cubed	¼ cup	Must be cold—warm butter makes a paste, not crumbs

Optional Toppings

• Warm maple syrup
• Fresh peach slices
• Powdered sugar
• Whipped cream
• Additional toasted pecans

Instructions

The Night Before

1. Prepare the baking dish. Grease a 9×13-inch baking dish generously with butter or nonstick cooking spray. Getting into all four corners prevents sticking, which matters more with gluten-free breads that don’t have the structural resilience of conventional loaves.
2. Build the first layer. Spread half of the gluten-free bread cubes evenly across the bottom of the dish. Try to keep the cubes in a mostly single layer rather than piling them—this ensures the custard reaches every piece.
3. Add the middle filling. Sprinkle half of the diced peaches and half of the chopped pecans evenly over the bread layer. This buried layer of fruit will release juice upward as it bakes, adding moisture and flavor from within.
4. Add the second layer. Arrange the remaining bread cubes on top, then scatter the remaining peaches and pecans over everything. The casserole will look very full at this stage—that’s correct.
5. Make the custard. In a large bowl, whisk together the eggs, milk, heavy cream, maple syrup, vanilla, cinnamon, nutmeg, and salt until smooth and uniform. Whisk for a full 60 seconds to ensure the eggs are fully incorporated and the cinnamon is distributed evenly.
6. Pour and press. Pour the custard slowly and evenly over the entire dish, moving from corner to corner. Then press down firmly with a spatula or clean hands until all the bread cubes are in direct contact with the custard. This pressing step is what separates a fully saturated casserole from one with dry pockets in the center.
7. Cover and refrigerate overnight. Cover the dish tightly with plastic wrap or foil and refrigerate for 8–12 hours. The bread will absorb nearly all of the custard by morning.

The Next Morning

8. Preheat the oven to 350°F (175°C). Pull the casserole from the fridge while the oven preheats—about 20–30 minutes of sitting at room temperature helps it bake more evenly and reduces the chance of a cold center with overcooked edges.
9. Make the streusel. In a medium bowl, combine the certified gluten-free rolled oats, almond flour, chopped pecans, brown sugar, and cinnamon. Add the cold cubed butter and cut it in using a pastry cutter or your fingertips until the mixture resembles coarse, uneven crumbs with some pea-sized pieces remaining. Cold butter is essential—it creates steam pockets as it bakes, which is what makes the topping shatter-crisp rather than dense.
10. Top the casserole. Sprinkle the streusel evenly over the soaked casserole. Don’t press it down—a loose, uneven layer crisps better than a packed one.
11. Bake uncovered for 45–55 minutes. The casserole is done when the edges are deeply golden, the center no longer jiggles when you nudge the dish, and the streusel has turned a warm amber-brown. A toothpick inserted in the center should come out clean with no wet custard on it.
12. Rest before cutting. Let the casserole rest for 10 minutes before serving—the custard finishes setting during this time. Cut too early and the squares will slump rather than hold their shape.
13. Serve with toppings. Serve warm with maple syrup, fresh peach slices, whipped cream, powdered sugar, or additional toasted pecans. All of it together is worth it.

Make It Your Own

Man, oh man—if you need a fully dairy-free version, it comes together easily. Replace the whole milk with full-fat oat milk or unsweetened coconut milk, swap the heavy cream for canned full-fat coconut cream, and use vegan butter in the streusel. The custard sets slightly firmer with coconut cream, which actually works beautifully in a casserole format.

For a gluten-free overnight french toast that leans more dessert-forward, add ½ teaspoon of almond extract to the custard alongside the vanilla. Almond and peach are a classic flavor pairing, and the extract amplifies the nuttiness of the pecan streusel without adding any actual nuts.

Frozen peaches make this a year-round recipe, not just a summer one. Thaw them completely overnight in a fine mesh strainer set over a bowl—you want to drain off as much liquid as possible before they go into the casserole. Undrained frozen peaches release significant water during baking, which can throw off the custard-to-bread ratio.

For a make-ahead brunch that feels more indulgent, fold ½ cup of mascarpone or cream cheese into the custard before pouring. It won’t fully incorporate—there will be small streaks—but those pockets of richness bake into the casserole and create an almost cheesecake-like layer in the center. It’s the variation I pull out when I want people to stop mid-bite and ask what’s in it.

If pecans aren’t your preference or you’re working around nut allergies, substitute the pecans throughout with toasted pepitas or sunflower seeds. The crunch holds up well in the streusel and through the bake, and the slightly neutral flavor lets the peach come forward even more. For more inspiration on gluten-free peach bakes, check out this peach crisp protein overnight quinoa for a lighter make-ahead option.

Common Problems & Solutions

Problem: The center is still wet and jiggly after 55 minutes. Tent the dish loosely with foil and continue baking in 5-minute increments. A wet center usually means the bread wasn’t pressed into full contact with the custard the night before, leaving air gaps that insulate the center from heat. An oven thermometer is worth using here—most home ovens run cooler than the dial indicates.

Problem: The streusel is soft and not crisping up. The butter wasn’t cold enough when the streusel was mixed. Warm or room-temperature butter creates a paste instead of crumbs, which bakes into a dense, oily layer rather than a shatter-crisp topping. If this happens mid-bake, remove the foil if you were using one and increase the oven to 375°F for the final 10 minutes.

Problem: The bread turned to mush. Well… this is the most common gluten-free overnight casserole failure, and it’s almost always a bread issue. Not all gluten-free breads can withstand a 12-hour custard soak—lean, low-fat sandwich breads break down overnight. Use a certified gluten-free brioche or an enriched bread with eggs and fat in the ingredient list. The Celiac Disease Foundation’s gluten-free bread guide is a helpful resource for understanding which bread types hold up to moisture-heavy applications.

Problem: The peaches made the bottom soggy. The peaches released more juice than expected during the soak. Next time, toss the diced peaches with 1 tablespoon of brown sugar and let them macerate for 15 minutes, then drain off the released juice before adding them to the casserole. This pre-releases the excess liquid before it can waterlog the bread.

Storage & Meal Prep

Method	Duration	Notes
Counter	2–3 hours max	Contains eggs and dairy; keep refrigerated
Fridge	5–7 days	Cover tightly; bring to room temp before reheating
Freezer	2–3 months	Wrap individual portions tightly before freezing

To reheat individual portions, microwave on medium power in 45-second increments until warmed through—high power can make the custard rubbery. For the whole dish, cover with foil and reheat at 300°F for 15–20 minutes until the center is warm.

Leftover portions also reheat beautifully in a skillet with a small knob of butter over medium-low heat. The bottom crisps up while the center warms through, and it tastes like something entirely different—closer to pan-fried French toast than a casserole. No waste, and honestly better the next day.

Peach Pecan Overnight French Toast Casserole FAQs

Serving Suggestions

This casserole was built for slow Sunday mornings and holiday brunches—it’s equally at home on a Mother’s Day table as it is on a lazy Labor Day weekend when you’d rather be outside than standing over a stovetop. Serve it with a simple fruit salad and good coffee, and you have everything you need.

If you’re serving a crowd and want to round out the spread, pair it with something lighter to balance the richness—this maple cinnamon protein oat bake works well alongside it for guests who want something a little less indulgent. For anyone who loves the peach-and-oat combination, the peach crisp protein overnight quinoa is another make-ahead option worth keeping on the rotation.

And if you’re feeding kids alongside the adults, the banana chocolate chip protein breakfast bars make a grab-and-go alternative that keeps the little ones happy while the grown-ups linger over the casserole.

If you make this recipe—especially if you add your own variation or a topping combination I haven’t thought of—I genuinely want to hear about it. Leave a comment below, share a photo on Pinterest, and give it a rating so other gluten-free home cooks can find it when they need a make-ahead brunch that actually delivers.