1- Preheat oven to 375º F. Grease muffin tins with baking spray, shortening, or butter and flour, then discard excess flour.

2- Sift together 2 cups (240 g) flour, baking powder, salt, and 2 teaspoons cinnamon in a bowl.

3- In a separate small bowl, mix 2 teaspoons flour and ½ teaspoon cinnamon for coating apples. Toss diced apples in this mixture until coated.

4- In a large bowl, cream ½ cup (113 g) butter and 1 cup (198 g) sugar until light, about 3 minutes.

5- Add eggs one at a time, mixing fully after each addition. Mix in vanilla extract.

6- Gently fold in the sifted flour mixture alternately with milk until just combined. Do not overmix.

7- Fold in the coated apple pieces.

8- Pour batter into prepared muffin tins, filling each 2/3 to 3/4 full.

9- Bake for about 30 minutes, or until a toothpick inserted into the center comes out clean.

10- While muffins bake, melt ½ cup (113 g) butter for topping and let cool slightly. In another bowl, combine ¼ cup (50 g) sugar and ¼ cup (31 g) cinnamon.

11- After muffins cool slightly, brush or dip the tops into the melted butter, then into the cinnamon sugar mixture.

12- Let muffins cool completely before serving.