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Preheat and Prepare: Preheat your oven to 375°F (190°C). Lightly grease an 8-inch or 9-inch square baking dish (or a similar-sized pie dish) with butter.
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Mix the Apple Filling: In the prepared baking dish, combine the sliced apples, 1/4 cup brown sugar, and 1/2 teaspoon cinnamon. Toss everything together with your hands until the apples are evenly coated. Spread them into a uniform layer.
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Make the Crumble Topping: In a separate medium bowl, whisk together the flour, oats, 2/3 cup brown sugar, cinnamon, nutmeg, and salt. Add the softened butter. Use a fork, your fingertips, or a pastry cutter to mix until the mixture is thoroughly combined and forms clumpy crumbs.
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Assemble and Bake: Sprinkle the crumble topping evenly over the apple layer, covering it completely.
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Bake to Perfection: Place the dish in the preheated oven and bake for 30-35 minutes, or until the topping is a deep golden brown and the apple filling is bubbly around the edges.
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Serve: Let the crisp cool for 10-15 minutes before serving. This allows the juices to thicken slightly. Serve warm, ideally with a scoop of vanilla ice cream or a dollop of whipped cream.
Enjoy your homemade taste of comfort!