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Preheat your oven to 375°F. Line a 6-cup muffin tin with paper liners or grease thoroughly with non-stick spray or butter.

Prepare the Streusel Topping: In a small bowl, combine the all-purpose flour, granulated sugar, light brown sugar, and ground cinnamon. Pour in the melted unsalted butter and mix with a fork until the mixture forms coarse, crumbly clumps. Set aside.

Prepare the Apple Filling: In another small bowl, toss the finely diced apple with lemon juice, ground cinnamon, and granulated sugar until evenly coated. Set aside.

Combine Dry Muffin Ingredients: In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, baking powder, ground cinnamon, and salt until well combined.

Combine Wet Muffin Ingredients: In a separate medium bowl, whisk together the large egg, milk, vegetable oil, and vanilla extract until thoroughly combined.

Combine Wet and Dry: Pour the wet ingredients into the dry ingredients. Stir gently with a spatula until just combined. Be careful not to overmix; a few lumps in the batter are perfectly normal.

Fold in Apples: Gently fold the prepared apple filling into the muffin batter until evenly distributed.

Fill Muffin Tin: Divide the muffin batter evenly among the prepared muffin cups, filling each about two-thirds full.

Add Streusel: Generously sprinkle the prepared streusel topping over the top of each muffin.

Bake Muffins: Transfer the muffin tin to the preheated oven and bake for 20 to 25 minutes, or until a wooden skewer or toothpick inserted into the center of a muffin comes out clean and the tops are golden brown.

Cool: Let the muffins cool in the muffin tin for 5 minutes before carefully transferring them to a wire rack to cool completely.


Preheat your oven to 375°F. Line a 6-cup muffin tin with paper liners or grease thoroughly with non-stick spray or butter.

Prepare the Streusel Topping: In a small bowl, combine the all-purpose flour, granulated sugar, light brown sugar, and ground cinnamon. Pour in the melted unsalted butter and mix with a fork until the mixture forms coarse, crumbly clumps. Set aside.

Prepare the Apple Filling: In another small bowl, toss the finely diced apple with lemon juice, ground cinnamon, and granulated sugar until evenly coated. Set aside.

Combine Dry Muffin Ingredients: In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, baking powder, ground cinnamon, and salt until well combined.

Combine Wet Muffin Ingredients: In a separate medium bowl, whisk together the large egg, milk, vegetable oil, and vanilla extract until thoroughly combined.

Combine Wet and Dry: Pour the wet ingredients into the dry ingredients. Stir gently with a spatula until just combined. Be careful not to overmix; a few lumps in the batter are perfectly normal.

Fold in Apples: Gently fold the prepared apple filling into the muffin batter until evenly distributed.

Fill Muffin Tin: Divide the muffin batter evenly among the prepared muffin cups, filling each about two-thirds full.

Add Streusel: Generously sprinkle the prepared streusel topping over the top of each muffin.

Bake Muffins: Transfer the muffin tin to the preheated oven and bake for 20 to 25 minutes, or until a wooden skewer or toothpick inserted into the center of a muffin comes out clean and the tops are golden brown.

Cool: Let the muffins cool in the muffin tin for 5 minutes before carefully transferring them to a wire rack to cool completely.
