Begin by preheating your oven to 350°F (175°C). This ensures your crumble bakes evenly and achieves a perfect golden topping.
In a large mixing bowl, combine the sliced peaches and fresh raspberries. Add in the granulated sugar, lemon juice, and vanilla extract. Gently toss the mixture until the fruit is well-coated with the ingredients. Transfer this juicy fruit mixture into a greased 9x9 inch baking dish, spreading it out evenly.
In a separate bowl, mix together the all-purpose flour, rolled oats, brown sugar, ground cinnamon, and salt. Stir these dry ingredients well to ensure everything is fully incorporated.
Next, add the cold, cubed butter into the dry mixture. Using your fingers or a pastry cutter, work the butter into the mixture until it resembles coarse crumbs. This step is essential for creating a deliciously crunchy topping.
Evenly sprinkle the crumble mixture over the peach and raspberry filling in the baking dish, ensuring a nice layer covers all the fruit.
Place the baking dish in the preheated oven and bake for 30-35 minutes, or until the crumble topping is golden brown and the fruit filling is bubbling. The delicious aroma will fill your kitchen!
Once done, remove the dish from the oven and allow it to cool for about 5-10 minutes before serving. This will make it easier to scoop and enjoy.
Notes
Serve warm with vanilla ice cream and garnish with mint.