01 -
Combine oats, brown sugar, flour, cinnamon, and melted salted butter in a mixing bowl. Stir with a spatula just until clusters form, aiming for a crumbly texture resembling damp sand with small clumps. Do not overmix.
02 -
Evenly distribute half of the oat mixture over the bottom of a lightly greased 23 x 23 cm baking dish. Press gently to form an even, rustic base without compacting too firmly.
03 -
Lay the prepared peach slices and strawberries uniformly over the crumble base, ensuring even coverage for balanced flavor in each serving.
04 -
In a small saucepan, whisk together brown sugar, cornstarch, salt, and water. Place over medium-high heat and cook, whisking constantly, until the mixture thickens to a glossy, pourable syrup. Remove from heat promptly to prevent over-thickening.
05 -
Stir vanilla extract into the hot syrup. Drizzle the syrup thoroughly over the arranged fruit, ensuring even distribution between fruit pieces.
06 -
Scatter the remaining oat mixture loosely across the fruit layer. Allow some fruit to remain visible to achieve a traditional, rustic crisp finish.
07 -
Bake in a preheated oven at 175°C (350°F) for 35 minutes. The crisp is ready when the topping is golden and fruit juices are bubbling at the edges.
08 -
For a deeply golden crust, switch oven to grill mode for 2–3 minutes with the dish on the top rack. Monitor closely to prevent burning.
09 -
Allow the crisp to rest for at least 15 minutes before serving to ensure the syrup sets and flavors meld. Serve warm, ideally with ice cream or lightly sweetened whipped cream if desired.