Step 1: Preheat Oven and Prepare Baking Dish: Preheat oven to 350F (175C). Grease a 9x13 inch baking dish with butter or cooking spray. A greased baking dish is crucial to prevent the dessert from sticking, ensuring easy removal and serving.
Step 2: Arrange Peaches in Baking Dish: Spread the sliced peaches evenly across the bottom of the prepared baking dish. Ensure the peaches are in a single layer to promote even cooking. Distribute the sliced peaches evenly for consistent baking and texture.
Step 3: Sprinkle Cake Mix Over Peaches: Evenly sprinkle the dry cake mix over the peaches, covering them completely. The cake mix should form a uniform layer on top of the fruit. Distribute cake mix to ensure uniform bake of the crumble and fruit.
Step 4: Drizzle with Melted Butter: Pour the melted butter evenly over the cake mix. Try to cover as much of the dry cake mix as possible. The butter will help create a golden and crumbly topping. Drizzle butter slowly for even saturation of the crumble.
Step 5: Add Optional Ingredients: If desired, sprinkle cinnamon and/or chopped nuts evenly over the top of the cake mix and butter. These additions enhance the flavor and texture of the dessert. Sprinkle evenly for even distribution of flavor and crunch.
Step 6: Bake: Bake in the preheated oven for 30-35 minutes, or until the topping is golden brown and the peaches are tender. Check the crumble during baking, and rotate if need to create uniform baking. The topping should be golden brown and slightly crisp.
Step 7: Cool Slightly and Serve: Let cool for about 10-15 minutes before serving. Serve warm, plain or with a scoop of vanilla ice cream or whipped cream. Cooling slightly allows the dessert to set a bit, making it easier to serve.
Optional Tips: For a richer flavor, use brown butter instead of melted butter. To make ahead, assemble the dessert and refrigerate it until ready to bake, baking time may need to increase 5 to 10 minutes.