Gluten-Free Maple Pecan Peach Crumble Cake

Make this gluten-free maple pecan peach crumble cake with just one bowl and no flour. Naturally sweetened, dairy-free, and ready in under an hour.

Peach season only lasts a few weeks, and I’ve learned the hard way not to waste a single ripe one. A few summers ago I had six big peaches sitting on the counter, softening fast, with no plan. I threw together this gluten-free maple pecan peach crumble cake on a whim—no flour, no butter, just pantry staples and fruit.

It came out bubbling, golden, and smelling like a harvest festival. My husband ate two servings before it had fully cooled down. That was the moment this recipe became a non-negotiable part of late summer in our house.

Well… if you’ve ever bought a bag of oats and a handful of pecans wondering what to do with them, you’re about thirty minutes of prep away from something genuinely worth making.

Why You’ll Love This Maple Pecan Peach Crumble Cake

• Naturally gluten-free and dairy-free: No specialty flours needed—rolled oats and pecans form the entire base of the crumble topping.
• One bowl, minimal cleanup: The topping comes together in a single mixing bowl. The peaches go straight into the baking dish. That’s it.
• Deep, layered flavor: Maple syrup caramelizes into the peaches as it bakes, producing a topping that crackles like praline and a filling that tastes like it simmered on the stove for an hour.
• Flexible for any occasion: Serve it warm as a dessert, cool as a brunch cake, or straight from the fridge the next morning. All three work.

The Secret to Perfect Gluten-Free Maple Pecan Peach Crumble Cake

• Pulse half the oats and pecans into flour: Processing 1 cup of oats and 1 cup of pecans to a fine, cornmeal-like consistency creates a sturdy crumble structure without any wheat flour. The natural oils in the pecans bind everything together as it bakes.
• Arrowroot starch thickens the filling: Tossing the peaches with arrowroot starch before baking draws out their juice and thickens it into a glossy, jammy filling. Cornstarch works the same way if that’s what you have on hand.
• Coconut oil replaces butter without compromise: Virgin coconut oil melts cleanly into the crumble and sets back up as the cake cools, giving the topping a crisp, slightly crunchy bite—according to nutrition research on virgin coconut oil, it also adds a mild natural sweetness that pairs naturally with both peach and maple.
• Resting time is not optional: The filling needs at least 15 minutes off the heat—ideally 30 to 45—to set up properly. Scooping too early means soupy filling, not sliceable cake.

Ingredients For Gluten-Free Maple Pecan Peach Crumble Cake

Serves 6

Ingredient	Amount	Notes
Peach Filling
Large ripe peaches (to yield 6 cups diced)	6–8	Use the ripest peaches you can find; soft spots are fine
Maple syrup	1/4 cup	Pure maple syrup only—pancake syrup won’t caramelize the same way
Arrowroot starch	3 tablespoons	Can sub cornstarch 1:1
Crumble Topping
Rolled oats, divided	1 1/2 cups	1 cup gets processed into flour; 1/2 cup stays whole for texture
Pecans, divided	2 cups	1 cup gets processed into flour; 1 cup gets roughly chopped
Maple syrup	3 tablespoons	Sweetens and helps the crumble bind together
Virgin coconut oil, melted	2 tablespoons	Virgin (unrefined) has a subtle flavor that complements the pecan
Vanilla extract	1 teaspoon	Use pure vanilla for best flavor
Baking powder	1 teaspoon	Adds just enough lift to the crumble so it doesn’t bake completely flat
Cinnamon	1/2 teaspoon	Warm and subtle—don’t skip it
Sea salt	1/4 teaspoon	Balances the sweetness and sharpens the peach flavor

Instructions

1. Preheat and prep your dish. Heat the oven to 375 degrees Fahrenheit. Get out a large baking or casserole dish roughly 10 inches long x 6 inches wide x 4 inches deep. You want a dish with high sides so the bubbling filling doesn’t spill over.
2. Build the peach filling. Dice the peaches into 1-inch pieces and place them directly into the baking dish. Pour the 1/4 cup of maple syrup over the top and sprinkle on the arrowroot starch. Toss everything together until the peaches are evenly coated—they’ll look slightly cloudy from the starch, which is exactly right.
3. Make the oat-pecan flour. Add 1 cup of rolled oats and 1 cup of pecans to a food processor or blender. Pulse in short bursts until the mixture reaches a fine, cornmeal-like consistency with no large pieces remaining. This becomes the flour base of your crumble topping.
4. Roughly chop the remaining pecans. Take the remaining 1 cup of pecans and chop them by hand or pulse them briefly in the food processor—you want chunky, irregular pieces, not dust. These whole bits create that satisfying crunch in every bite of the finished gluten-free crumble cake.
5. Mix the crumble topping. Pour the oat-pecan flour into a mixing bowl. Add the chopped pecans, remaining 1/2 cup of rolled oats, 3 tablespoons of maple syrup, melted coconut oil, vanilla extract, baking powder, cinnamon, and sea salt. Stir firmly until everything is evenly combined and the mixture clumps when pressed between your fingers.
6. Top the peaches and bake. Use your hands to crumble and scatter the topping in an even layer over the peaches—don’t pack it down. Bake for 45 to 55 minutes, until the top is deeply golden and you can see the peach filling bubbling up around the edges with a nutty, caramelized aroma filling the kitchen.
7. Rest before serving. Remove from the oven and let the dish cool for at least 15 minutes—30 to 45 is better. The filling thickens as it cools, so patience here pays off. Serve warm or at room temperature, ideally with a scoop of vanilla ice cream or a cloud of whipped cream on top.
   

Make It Your Own

Swap the peaches for nectarines, plums, or a mix of stone fruit and this recipe adapts without any other changes. The arrowroot starch works the same way regardless of which fruit you use, so the filling will still set up firm and jammy. Stone fruit all share a similar moisture content, which makes this one of the most forgiving gluten-free crumble cake formulas I’ve tested.

You know… this recipe also works beautifully in early fall with ripe Bartlett pears swapped in for the peaches. Add a pinch of cardamom to the crumble topping alongside the cinnamon and it becomes a completely different dessert—warm, spiced, and ideal for a Thanksgiving table alongside your other gluten-free sides.

For a nut-free version, replace all of the pecans with an equal quantity of sunflower seeds. Process 1 cup into fine flour the same way and roughly chop the remaining cup. The texture and binding are nearly identical—the flavor shifts to something more neutral but still satisfying as a gluten-free brunch cake.

If you want a richer topping, stir in two tablespoons of almond butter or sunflower seed butter with the crumble ingredients. It adds a deeper, almost toffee-like note to the maple pecan layer and makes the crumble bind into thicker, more defined chunks as it bakes.

For more easy gluten-free fruit-forward recipes, the gluten-free Kool-Aid pineapple spears are a fun no-bake option worth keeping in your back pocket during summer.

Common Problems & Solutions

Problem: The filling is watery and won’t set up.
Make sure you used the full 3 tablespoons of arrowroot starch and that the dish baked long enough to see active bubbling around the edges. The filling only thickens as it cools—if you scoop it hot, it will always seem loose. Give it a full 30 to 45 minute rest after baking.

Problem: The crumble topping is soft and not crunchy.
This usually means the topping went on too thick in some spots or the oven temperature was slightly off. Spread the crumble in a thinner, more even layer next time. You can also return the dish to the oven for an extra 5 to 10 minutes uncovered if the top isn’t golden after 55 minutes.

Problem: The topping tastes dry or bland.
Man, oh man… this is almost always a sign that the oat-pecan flour wasn’t processed finely enough. Larger pieces don’t absorb the maple syrup and coconut oil evenly. Pulse longer until you genuinely reach a fine, cornmeal-like texture—the difference in the finished cake is significant.

Problem: The peaches released too much liquid and made the bottom soggy.
Very ripe peaches hold more water than firm ones. If your peaches are especially soft, increase the arrowroot starch to 4 tablespoons and toss the peaches thoroughly so every piece is coated. This draws more moisture into the thickener before it even hits the oven.

As noted by trusted celiac nutrition resources, oats can sometimes be a concern for those with celiac disease due to cross-contamination during processing. If you’re cooking for someone with celiac, look for oats specifically labeled “certified gluten-free” to be safe.

Storage & Meal Prep

Method	Duration	Notes
Counter	2–3 days	Cover the baking dish with a clean towel or foil; filling continues to set
Fridge	5–7 days	Airtight container; bring to room temperature or warm briefly before serving
Freezer	2–3 months	Portion into individual servings and wrap tightly; thaw overnight in the fridge

To reheat from the fridge, scoop a portion into a small oven-safe dish and warm at 325 degrees for 10 to 12 minutes. This re-crisps the topping far better than the microwave, which softens it.

For meal prep, you can assemble the entire dish—filling and crumble—the night before and refrigerate it unbaked. Pull it out in the morning, let it sit at room temperature for 20 minutes, then bake as directed. It works well for a weekend brunch where you want the oven to do the work while you’re getting ready.

FAQs About Gluten-Free Maple Pecan Peach Crumble Cake

Serving Suggestions

This gluten-free crumble cake is a natural match for a lazy Sunday brunch alongside a fruit salad and something savory like these crispy smashed pickle potatoes—the tangy, salty potatoes balance the sweet peach filling in a way that genuinely works.

For dessert after a summer dinner, pair it warm with a scoop of coconut milk ice cream and a drizzle of extra maple syrup. If you’re serving a crowd, set out both the crumble cake and something cold and bright like this gluten-free pineapple orange cream smoothie and you’ve covered every preference at the table.

Give this recipe a try and let me know how it turns out in the comments below—I especially want to hear if you tried a different fruit or added any spices to the crumble.

If you loved it, sharing it on Pinterest helps other gluten-free families find it too. A photo of that golden topping straight from the oven goes a long way.