Apple Cinnamon Muffins Recipe

Preheat oven to 400°F. Grease a 12-cup muffin tin or line with paper liners.

In a large bowl, whisk together the flour, both sugars, baking powder, cinnamon, and salt until combined.

Add the oil, egg, and milk to the dry ingredients and stir just until combined — do not overmix. The batter will look thicker than a typical muffin batter. That's normal. The apple releases moisture as it bakes and keeps the muffins tender.

Fold in the chopped apple with a spatula until evenly distributed.

Divide the batter evenly among the 12 muffin cups, filling each about ¾ full.

Make the streusel: in a small bowl, combine the sugar, flour, and cinnamon. Add the cold butter cubes and use a fork or pastry cutter to work the butter into the dry ingredients until the mixture resembles coarse, uneven crumbs. Do not use softened butter — cold butter is what creates the crumble texture.

Sprinkle the streusel generously over each unbaked muffin.

Bake 18–20 minutes, or until a toothpick inserted in the center of a muffin comes out clean and the tops spring back lightly when touched. Let cool in the tin for 5 minutes, then transfer to a wire rack.