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Preheat your oven to 400°F. Line a 12-cup muffin tin with paper liners or grease it thoroughly with butter or non-stick spray.

In a large bowl, whisk together the all-purpose flour, granulated sugar, light brown sugar, baking powder, ground cinnamon, and salt for the muffins. Set aside.

In a separate medium bowl, whisk together the large egg, milk, melted unsalted butter, and vanilla extract until well combined.

Pour the wet ingredients into the dry ingredients. Stir gently with a spatula until just combined. Be careful not to overmix; a few lumps are fine. Fold in the diced apples.

If making the streusel topping: In a small bowl, combine the all-purpose flour, light brown sugar, and ground cinnamon. Cut in the cold unsalted butter with a pastry blender or your fingertips until the mixture resembles coarse crumbs.

Divide the muffin batter evenly among the 12 prepared muffin cups, filling each about two-thirds full. If using, sprinkle the streusel topping generously over the batter in each cup.

Bake for 18-22 minutes, or until a wooden skewer inserted into the center of a muffin comes out clean. The tops should be golden brown. Let the muffins cool in the tin for 5 minutes before transferring them to a wire rack to cool completely.

While the muffins cool, prepare the caramel glaze: In a small saucepan over medium heat, melt the unsalted butter. Add the light brown sugar and milk, stirring until the sugar dissolves and the mixture comes to a gentle boil. Remove from heat.

Whisk in the powdered sugar, vanilla extract, and a pinch of salt until the glaze is smooth. If it's too thick, add a tiny bit more milk (1/2 teaspoon at a time) until it reaches a pourable consistency. If too thin, add a bit more powdered sugar.

Once the muffins are completely cool, drizzle the caramel glaze generously over each muffin. Allow the glaze to set slightly before serving.


Preheat your oven to 400°F. Line a 12-cup muffin tin with paper liners or grease it thoroughly with butter or non-stick spray.

In a large bowl, whisk together the all-purpose flour, granulated sugar, light brown sugar, baking powder, ground cinnamon, and salt for the muffins. Set aside.

In a separate medium bowl, whisk together the large egg, milk, melted unsalted butter, and vanilla extract until well combined.

Pour the wet ingredients into the dry ingredients. Stir gently with a spatula until just combined. Be careful not to overmix; a few lumps are fine. Fold in the diced apples.

If making the streusel topping: In a small bowl, combine the all-purpose flour, light brown sugar, and ground cinnamon. Cut in the cold unsalted butter with a pastry blender or your fingertips until the mixture resembles coarse crumbs.

Divide the muffin batter evenly among the 12 prepared muffin cups, filling each about two-thirds full. If using, sprinkle the streusel topping generously over the batter in each cup.

Bake for 18-22 minutes, or until a wooden skewer inserted into the center of a muffin comes out clean. The tops should be golden brown. Let the muffins cool in the tin for 5 minutes before transferring them to a wire rack to cool completely.

While the muffins cool, prepare the caramel glaze: In a small saucepan over medium heat, melt the unsalted butter. Add the light brown sugar and milk, stirring until the sugar dissolves and the mixture comes to a gentle boil. Remove from heat.

Whisk in the powdered sugar, vanilla extract, and a pinch of salt until the glaze is smooth. If it's too thick, add a tiny bit more milk (1/2 teaspoon at a time) until it reaches a pourable consistency. If too thin, add a bit more powdered sugar.

Once the muffins are completely cool, drizzle the caramel glaze generously over each muffin. Allow the glaze to set slightly before serving.
