Shatteringly Crispy Peach Crisp with Brown Butter
The problem with most fruit crisps is structural. This one fixes that with a single technique: toasting oats in brown butter before they ever see the fruit. The result is a shatteringly crunchy topping that stays crisp for hours, layered over jammy, concentrated peaches.
Equipment
- 9x13 Baking Dish
- Medium saucepan
- Mixing Bowl (2)
- Spatula
- Wire Rack
- Foil-lined Baking Sheet
Ingredients
Filling
- 6 cups ripe but firm peaches, sliced 1/2-inch thick
- 1/4 cup granulated sugar
- 2 tablespoons cornstarch
- 1 tablespoon fresh lemon juice
Topping
- 1 cup rolled oats (not quick-cooking)
- 1/2 cup all-purpose flour
- 1/2 cup packed light brown sugar
- 1/2 cup unsalted butter
- 1/2 teaspoon kosher salt
- 1 teaspoon vanilla extract
Instructions
- Preheat your oven to 375°F (190°C). Position a rack in the center. Grease your 9x13 dish with a little butter.
- Brown the butter: Place the 1/2 cup butter in a medium saucepan over medium heat. Swirl occasionally. It will foam, then the milk solids will turn golden brown. This takes about 5-7 minutes. The moment it smells nutty and looks amber, pull it off the heat.
- Toast the oats: To the warm browned butter, add the rolled oats and flour. Stir constantly over medium-low heat for 2-3 minutes until the oats smell deeply nutty and turn a shade darker. Remove from heat and let cool slightly.
- Mix the dry topping: Stir the brown sugar, salt, and vanilla into the oat mixture until combined. It will look crumbly and smell like the best granola you've ever had. Set aside.
- Prepare the filling: In a large bowl, gently toss the sliced peaches with the granulated sugar, cornstarch, and lemon juice. Make sure every slice is coated.
- Assemble: Pour the peach filling into the prepared baking dish. Spread it into an even layer. Sprinkle the oat topping evenly over the top. Do not press it down.
- Bake: Place the dish on a foil-lined baking sheet to catch drips. Bake for 40-45 minutes, until the filling is bubbling at the edges and the topping is deep golden brown.
- Cool: Let the crisp cool on a wire rack for at least 20 minutes before serving. The filling needs time to set up.
Notes
Key tips for success: Don't overmix the oat topping – stir just until combined. Always use a foil-lined baking sheet under the dish to catch drips. Let the crisp cool completely before covering to avoid steaming the topping. Serve with vanilla ice cream, crème fraîche, or a sprinkle of flaky salt.
Make-ahead: Bake the crisp, cool completely, cover tightly, and refrigerate for up to 4 days. Reheat in a 350°F oven. The topping stays crunchy thanks to the browned butter treatment.
Variations: For gluten-free, use certified GF oats and a 1:1 GF flour blend. For vegan, use vegan butter (it browns beautifully). Swap half the peaches for nectarines or plums. Add 1/4 tsp cinnamon and a pinch of nutmeg for a chai twist. For a boozy version, add 1 tbsp bourbon or dark rum to the filling.
Frozen peaches: Thaw and drain first, reduce cornstarch to 1 tbsp, and bake as directed. Texture will be softer but flavor remains.