Preheat your oven to 350°F (175°C) and lightly grease a 9-inch baking dish.
In a large mixing bowl, combine the sliced peaches and fresh raspberries. Add the granulated sugar, lemon juice, and vanilla extract, gently tossing to combine. Transfer the fruit mixture into the prepared baking dish.
In another bowl, mix together the flour, rolled oats, brown sugar, ground cinnamon, and salt. Pour the melted butter into the dry mixture and stir until crumbly.
Sprinkle the crumble mixture evenly over the fruit in the baking dish.
Bake in the preheated oven for 30-35 minutes, or until the crumble is golden brown and the fruit is bubbling.
Allow to cool for a few minutes before serving warm.
Notes
Serve warm with vanilla ice cream or whipped cream, garnished with whole raspberries.