Refined Sugar Free Peach Crumble (Gluten Free, Easy)

Name: Refined Sugar Free Peach Crumble
Prep time: 10 min
Cook time: 40 min
Total time: 50 min
Ingredients: 3 cups sliced peaches (fresh or frozen and thawed); 2 tbsp maple syrup; 1 tbsp arrowroot powder (or cornstarch); 1/2 tsp cinnamon; Pinch of nutmeg; 1 tsp vanilla extract; 1 cup oat flour; 1 cup fine blanched almond flour; 1/2 cup coconut sugar; 1/2 cup butter (melted); 1 tsp vanilla extract; Pinch of salt

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Bubbling peach filling. Golden crispy topping. The whole kitchen smelling like a bakery for 40 minutes. This is that recipe.

No refined sugar, naturally gluten free, and it works with fresh or frozen peaches so you can make it in August or January with the same result. The crumble topping is made with oat flour and almond flour and it’s genuinely better than a traditional crumble — crispier, richer, and with more texture than a one-flour topping can give you.

One bowl for the topping. Everything else goes straight into the baking dish. Done.

If you’re into wholesome baked desserts, the almond flour shortbread cookies and the banana bread blondies belong in your rotation too.

Why The Two-Flour Topping Is Worth It

Oat flour gives the topping structure and a subtle nutty, whole grain flavor. Without it the topping is too loose and doesn’t hold any shape.

Almond flour is what makes it actually crispy. The fat content in almond flour is doing most of the texture work — it gives the topping that melt-in-your-mouth quality alongside the crunch. Use fine blanched almond flour here, not almond meal. Almond meal is coarser and makes the topping gritty in a way that’s hard to ignore.

Together they give you a topping that’s golden, crispy, slightly rich, and has real texture variation with visible chunks. That’s the goal.

Ingredients You’ll Need

For the peach filling:

Sliced peaches, fresh or frozen: fresh in season is ideal. If you’re using frozen, thaw completely and pat them dry with paper towels before using. Frozen peaches release a lot of extra liquid and if that liquid goes into the dish undrained the filling will be watery and the topping will steam instead of crisp. The pat-dry step takes 30 seconds and matters a lot.
Maple syrup: sweetens the filling without any refined sugar. Real maple syrup, not pancake syrup. Honey is a direct swap.
Arrowroot powder: this is what thickens the peach juices into a glossy, jammy filling instead of a watery puddle at the bottom of the dish. Don’t skip it. Cornstarch works exactly the same way.
Cinnamon and nutmeg: cinnamon is the main spice. The nutmeg is just a pinch but you’ll notice if it’s missing, it adds depth without tasting identifiably like nutmeg.
Vanilla extract: one teaspoon in the filling makes the peaches taste like a real dessert filling, not just baked fruit.

For The Crumble Topping:

Oat flour: structure and flavor. Use certified gluten-free oat flour if that matters for your household.
Fine blanched almond flour: this is what makes the topping crispy. Not almond meal. Fine blanched almond flour only.
Coconut sugar: sweetens the topping with a warm, slightly caramel flavor that white sugar can’t replicate. It also helps the topping brown beautifully.
Melted butter: binds everything and adds richness. Melted butter coats the flour mixture more evenly than cold butter, which gives you more consistent crumble texture across the whole top. Melted coconut oil is the dairy-free swap.
Vanilla extract and a pinch of salt: both go in the topping as well as the filling. Both layers having vanilla is what makes the dish taste cohesive. The salt makes every other flavor in the topping taste more like itself.

Easy swaps

Cornstarch instead of arrowroot: direct one-to-one swap, same result.
Brown sugar instead of coconut sugar: same caramel undertone, same behavior in the topping.
Melted coconut oil instead of butter: makes it dairy-free. Slightly different flavor but still very good.
Different fruit: nectarines are the most direct swap. Blueberries, raspberries, or a peach-berry mix all work well. Keep the total fruit at three cups. The strawberry cheesecake clusters use a similar clean-ingredient summer fruit philosophy if you want another wholesome dessert option.

Troubleshooting

Filling came out watery. Frozen peaches weren’t patted dry, or the arrowroot wasn’t evenly distributed. Toss the peaches thoroughly before spreading. Add an extra half tablespoon of arrowroot next time if it’s still too loose.
Crumble top is soggy. Topping was pressed down or the filling was too wet. Keep it loose and dry those frozen peaches.
Top browned before the filling was ready. Tent loosely with foil for the last 10 minutes.
Topping tastes flat. Salt was skipped or vanilla in the topping was left out. Both matter more than they seem.
Topping is crumbly but not crispy. Try the broiler for 60 to 90 seconds or check that you used fine blanched almond flour and not almond meal.

How to Make This Recipe

Step 1: Preheat and Make Peach Filling. Preheat oven to 350°F and lightly grease an 8×8 or 9×9 baking dish. Add sliced peaches directly to the baking dish. Pour maple syrup, arrowroot, cinnamon, nutmeg, and vanilla over the top and toss everything together right in the dish until every slice is coated. Spread into an even layer.

Step 2: Make the crumble topping. In a bowl combine oat flour, almond flour, coconut sugar, and salt. Pour in melted butter and vanilla and mix with a fork or your hands until crumbly with a mix of small and medium chunks. Stop before it turns into a uniform dough. The clumps are the point.

Step 3: Assemble. Scatter the crumble topping over the peaches. Leave larger chunks intact. Do not press it down. Pressing compacts the topping, traps steam underneath, and you lose the crispy texture entirely. Keep it loose.

Step 4: Bake and cool. Bake uncovered at 350°F for 35 to 40 minutes until the top is genuinely golden brown and the filling is actively bubbling around the edges. For extra crispiness, broil for one to two minutes at the very end and watch it closely. Let it rest for 20 to 30 minutes before scooping. The arrowroot continues to set as it cools and if you scoop it straight from the oven the filling will be runny. This rest is not optional.

Tips For Getting It Just Right

Thaw and pat frozen peaches dry. This is the most important tip in the whole recipe.
Do not press the crumble down. Leave it loose.
Fine blanched almond flour only. Not almond meal.
The 20 to 30 minute rest is worth it every single time.
Want extra crunch? Add half a cup of chopped pecans or walnuts to the crumble topping before baking.
Want an even crispier top? One to two minutes under the broiler at the very end.

How to Serve

Warm with vanilla ice cream is the classic for a reason. The cold ice cream melting into the warm crumble filling is hard to beat. Greek yogurt keeps it lighter and adds a tangy contrast. Whipped cream if you want to keep it simple.

It also works as breakfast over plain Greek yogurt, which sounds indulgent but the ingredients hold up to it completely.

Storage

Room temperature covered for up to 24 hours. Fridge in an airtight container for up to four days — the topping softens slightly but crisps back up in a 350°F oven or the air fryer. Freezer for up to two months. Thaw overnight in the fridge and reheat at 350°F for 15 to 20 minutes.

frequently asked questions

Can I use frozen peaches?

Yes. Thaw completely and pat dry before using. The moisture from frozen peaches is the main cause of a soggy crumble so the pat-dry step genuinely matters.

Do I need both flours?

Yes. They each do different jobs and together is what gives the topping that texture. Oat flour alone is too dense. Almond flour alone is too greasy. Together they’re the thing.

Can I make it ahead?

Yes. Assemble through step 3, cover, and refrigerate up to 24 hours. Add five to ten minutes to the bake time from cold.

Can I use other fruits?

Yes. Nectarines, blueberries, raspberries, or a mix. Keep the total at three cups.

Refined Sugar Free Peach Crumble