Grease a muffin tin or line it with paper cases.Mix the dry ingredients:In a medium bowl, whisk together the flour, baking powder, baking soda, salt, nutmeg, and cinnamon.Mix the wet ingredients:In another large bowl, whisk together the melted butter, granulated sugar, brown sugar, eggs, milk, and vanilla until smooth.Mix:Gradually stir the dry ingredients into the wet mixture just until combined. Do not overmix.Bake:Spread the batter evenly among the muffin tins, filling each tin about ¾ full. Bake for 15–18 minutes or until a toothpick inserted into the center comes out clean.Cool slightly:Let the muffins cool in the tin for 5 minutes, then transfer them to a wire rack.Sweeten with cinnamon sugar:In a small bowl,
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