Tender cinnamon-spiced apple muffins rolled in buttery cinnamon-sugar, just like your favorite snickerdoodle cookie—crisp tops, soft centers, and juicy apple bits in every bite.
Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or grease lightly.
In a small bowl, mix 0.33 cup granulated sugar with 1.0 tsp ground cinnamon for the coating; set aside. Melt 2.0 tbsp butter for brushing and set aside.
In a large bowl, whisk flour, baking powder, baking soda, 2.0 tsp cinnamon, and salt until evenly combined.
In a separate bowl, whisk melted 0.5 cup butter with 0.75 cup granulated sugar and 0.25 cup brown sugar until glossy. Whisk in eggs, milk, and vanilla until smooth.
Pour wet ingredients into dry ingredients and stir gently until just combined; do not overmix.
Fold in the finely diced apples until evenly distributed.
Divide batter evenly among muffin cups, filling each about 0.75 full.
Bake 16 to 18 minutes, or until tops are set and a toothpick inserted in the center comes out with a few moist crumbs.
Cool in the pan 5 minutes. Brush warm muffin tops with the melted butter and immediately roll or sprinkle with the cinnamon-sugar mixture to coat.
Transfer to a wire rack to finish cooling. Serve warm or at room temperature.
Notes
For extra apple flavor, use a mix of tart and sweet apples. Muffins keep covered at room temperature for 2 days or freeze up to 2 months.