Preheat oven: Set to 375°F (190°C) and line a muffin pan with paper liners or grease lightly.
Mix dry ingredients: In a bowl, whisk together the flour, baking powder, and salt.
Combine wet ingredients: In another bowl, whisk melted butter, sugar, eggs, milk, and vanilla until smooth.
Make the batter: Gently fold the dry ingredients into the wet mixture until just combined — don’t overmix!
Fill and bake: Spoon the batter evenly into the muffin cups, filling each about ¾ full. Bake for 18–20 minutes, or until a toothpick inserted in the center comes out clean.
Cool and enjoy: Let the muffins cool slightly before serving warm.
