Ingredients
1 1/2 cups all-purpose flour
1 cup quick-cooking oats
2 1/4 teaspoons baking powder
1 teaspoon coarse salt
1/2 teaspoon ground cinnamon
3/4 cup sugar
2 large eggs
1 stick unsalted butter, melted and cooled
1/2 cup whole milk
1 Macintosh apple, peeled and cut into 1/4-inch dice (1 1/4 cups)
Crumb Topping for Muffins(optional)
Preparation
Preheat oven to 350 degrees. Line a standard 12-cup muffin tin with baking cups. In a medium bowl, whisk together flour, oats, baking powder, salt, and cinnamon. In a separate bowl, whisk together sugar, eggs, butter, and milk. Stir wet ingredients into dry ingredients, then stir in apple.
Divide batter evenly between muffin cups, adding a scant 1/4 cup to each. Sprinkle with crumb topping if desired. Bake until tops spring back when lightly touched, about 20 minutes. Cool in pans 5 minutes, then remove to wire rack to cool completely.
