Preheat your oven to 375°F. Line a 12-cup muffin tin with paper liners or grease with nonstick spray.

In a medium bowl, whisk together flour, sugar, baking powder, cinnamon, and salt. Set aside.

In a large bowl, whisk together melted butter, milk, eggs, nutmeg (if using), and vanilla extract until smooth.

Gently stir the dry ingredients into the wet ingredients just until combined—avoid overmixing.

Divide the batter evenly among the muffin cups, filling each about 2/3 full.

Bake for 20–25 minutes, or until a toothpick inserted in the center comes out clean.

Let muffins cool in the tin for 5 minutes, then transfer to a wire rack.

While still warm, dip the muffin tops in the cinnamon sugar mixture to coat. For a crispier top, return to the oven for 2–3 minutes.

Serve warm with optional toppings like maple syrup, powdered sugar, berries, or nuts.