
Made with orange zest and juice, these versatile muffins have a delicate orange flavor that pairs perfectly with other mix-ins such as chocolate chips or cranberries.
Preheat oven to 375℉/190℃. Grease 12 muffin cups or line them with liner papers.
In a large bowl, toss together sugar and orange zest to infuse the orange oils into the sugar.
Add flour, baking powder, and salt, and mix to combine. In another medium bowl, whisk eggs with melted butter, sour cream, milk, orange juice, and vanilla extract until well combined.
Make a well in the dry ingredients and pour the wet ingredients into it, then stir with a wooden spoon or rubber spatula just until combined. Do not overmix. Fold in add-ins (optional).
Divide batter evenly between muffin cups (almost all the way to the top). Bake for 15-20 minutes or until a toothpick inserted into the center of the muffin comes out clean. Allow to cool for 10 minutes, then remove muffins from the tin and transfer to a wire rack to cool completely.
Muffins are best the same day they are made, but can be stored in an airtight container at room temperature for an additional day. Muffins can be frozen for up to 2 months, thaw at room temperature or overnight in the refrigerator.