Sour Cream Chocolate Chip Muffins

1. Preheat the oven to 350ºF.
2. Mix together the flour, sugar, baking powder, baking soda, and salt.
3. In another bowl, combine the egg, sour cream, melted butter, and vanilla extract, mixing well.
4. Add the wet ingredients to the dry ingredients and mix until just combined.
5. Gently add in the chocolate chips until thoroughly combined.
6. Evenly divide the batter among the prepared cupcake liners so that the liners are about 3/4 full.
7. Bake until a tester inserted into the center of the muffins comes out clean, about 16-18 minutes.