How to Make It
Preheat oven to 400°F. Lightly grease a 12- cup muffin pan with cooking spray or line with baking liners.
Place apple and granulated sugar in a medium bowl; toss to coat, and let stand 10 minutes.
Meanwhile, whisk together flour, brown sugar, baking powder, salt, and cinnamon in a large bowl.
Stir milk, melted butter, vanilla, and eggs into apple mixture; add to flour mixture, stirring until just combined. Divide batter evenly among prepared muffin cups.
Bake in preheated oven until a wooden pick inserted in center comes out clean, 18 to 19 minutes.
While muffins bake, stir together granulated sugar, ground cinnamon, ground ginger, ground nutmeg, ground allspice, and ground cloves in a bowl. Place 1⁄2 cup melted salted butter in a separate small bowl.
Remove muffins from oven and cool in pan 5 minutes; remove muffins to a wire rack, and let cool 10 minutes. Carefully dip tops of warm muffins in melted butter; dredge tops in spice mixture or sprinkle spice mixture over tops of muffins. Return muffins to wire rack. Serve warm or at room temperature.