Making Blueberry Peach Crumble requires a straightforward approach. Follow these steps for a delicious outcome:

1. Preheat your oven: Set the oven to 350°F (175°C).
2. Prepare the fruit filling: In a large bowl, combine the blueberries, sliced peaches, granulated sugar, lemon juice, and cinnamon. Mix gently and set aside.
3. Make the crumble topping: In another bowl, mix together the oats, flour, brown sugar, melted butter, and salt. Optionally, add nutmeg for additional flavor.
4. Assemble the dish: Spread the fruit mixture evenly in a greased 9×13 inch baking dish.
5. Add the crumble: Evenly distribute the crumble topping over the fruit mixture, ensuring full coverage.
6. Bake: Place the baking dish in the preheated oven and bake for 30-35 minutes or until the topping is golden brown and the filling is bubbly.
7. Cool: Remove from the oven and let it cool for 10 minutes, allowing the flavors to meld together.
8. Optional step: While cooling, you could prepare a scoop of vanilla ice cream for serving.

By following these simple instructions, you will create a tasty Blueberry Peach Crumble that highlights the natural flavors of the fruits combined with a delectable topping.