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Preheat your oven to 375°F. Lightly grease a 12-cup standard muffin tin or line with paper liners.
In a medium bowl, combine the finely diced apples, 2 tablespoons of packed brown sugar, 1/2 teaspoon of ground cinnamon, 1/2 teaspoon of lemon juice, and 1 teaspoon of cornstarch. Toss gently until the apples are evenly coated. Set aside.
In a separate medium bowl, prepare the crumble topping. Whisk together 1/2 cup of all-purpose flour, 1/4 cup of rolled oats, 1/4 cup of packed brown sugar, and 1/4 teaspoon of ground cinnamon. Add the 1/4 cup of cold, cut unsalted butter pieces. Using your fingertips or a pastry blender, cut the butter into the dry ingredients until the mixture resembles coarse crumbs with some pea-sized pieces of butter remaining.
Divide the apple filling evenly among the 12 prepared muffin cups. Each cup should be about two-thirds full.
Evenly sprinkle the crumble topping over the apple filling in each cup, pressing lightly to adhere.
Bake in the preheated oven for 17 to 20 minutes, or until the apple filling is bubbly and the crumble topping is golden brown and crisp. Keep an eye on them to prevent over-browning.
Remove the muffin tin from the oven and let the mini apple crumble cups cool in the tin for 5 minutes before carefully transferring them to a wire rack to cool completely. Serve warm or at room temperature.

Preheat your oven to 375°F. Lightly grease a 12-cup standard muffin tin or line with paper liners.
In a medium bowl, combine the finely diced apples, 2 tablespoons of packed brown sugar, 1/2 teaspoon of ground cinnamon, 1/2 teaspoon of lemon juice, and 1 teaspoon of cornstarch. Toss gently until the apples are evenly coated. Set aside.
In a separate medium bowl, prepare the crumble topping. Whisk together 1/2 cup of all-purpose flour, 1/4 cup of rolled oats, 1/4 cup of packed brown sugar, and 1/4 teaspoon of ground cinnamon. Add the 1/4 cup of cold, cut unsalted butter pieces. Using your fingertips or a pastry blender, cut the butter into the dry ingredients until the mixture resembles coarse crumbs with some pea-sized pieces of butter remaining.
Divide the apple filling evenly among the 12 prepared muffin cups. Each cup should be about two-thirds full.
Evenly sprinkle the crumble topping over the apple filling in each cup, pressing lightly to adhere.
Bake in the preheated oven for 17 to 20 minutes, or until the apple filling is bubbly and the crumble topping is golden brown and crisp. Keep an eye on them to prevent over-browning.
Remove the muffin tin from the oven and let the mini apple crumble cups cool in the tin for 5 minutes before carefully transferring them to a wire rack to cool completely. Serve warm or at room temperature.