Preheat your oven to 375℉. Lightly grease your ramekins with butter.
Wash your peaches. Peel them if you prefer, but it's not necessary, then slice them into wedges.
In a mixing bowl, mix the peaches, blueberries, brown and white sugars, corn starch, and cinnamon. Toss the fruit to coat, add the vanilla, and give a final stir.
In another bowl, combine the flour, brown sugar, and cinnamon. This is your crumble mixture.
Melt the butter and add it to the crumble mixture. Mix until combined into a texture like wet sand.
Spoon your fruit mix into your baking dish or ramekins. Try to transfer the fruit without too much liquid.
Spread your crumble topping evenly across the fruit.
Bake for 25 minutes. When done, let cool for about 10 minutes, then enjoy!