This overnight apple cinnamon dump cake is the ultimate easy dessert or breakfast treat. With just five ingredients and a simple overnight rest, you get tender, jammy apples under a crisp, buttery cake topping—perfect for cozy mornings or holiday brunches.
For best results, use a glass or ceramic baking dish. If using a metal pan, reduce oven temperature to 325°F (160°C) and check at 40 minutes. The overnight rest is essential for the best texture and flavor; do not skip it. If you are in a hurry, you can bake immediately, but the apples will be firmer and the flavor less developed.
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