In a large mixing bowl, combine the sliced peaches, fresh raspberries, granulated sugar, lemon juice, and vanilla extract. Gently toss until the fruits are coated in the mixture. Pour this mixture into a greased 9x9 inch baking dish.
In another bowl, combine the flour, rolled oats, brown sugar, ground cinnamon, and salt. Stir to combine.
Add the cold, cubed butter to the dry mixture. Using your fingers or a pastry cutter, mix until the mixture resembles coarse crumbs.
Sprinkle the crumble topping evenly over the peach and raspberry mixture in the baking dish.
Bake in the preheated oven for 30-35 minutes or until the top is golden brown and the fruit is bubbly.
Remove from the oven and allow to cool for a few minutes before serving.
Notes
Serve warm with a scoop of vanilla ice cream on top and garnish with a sprig of mint for added freshness. Enjoy!