Sour Cream Chocolate Chip Muffins

Sour Cream Chocolate Chip Muffins (from Renee)
Makes 1 large dozen or 2 dozen mini-muffins
~
5 tablespoons butter, melted and cooled
2/3 cup sugar
1 teaspoon vanilla extract
1/4 teaspoon salt
1 cup sour cream
1 large egg
3/4 teaspoon baking soda
3/4 teaspoon baking powder
1 1/2 cups all purpose flour
3/4 cups miniature chocolate chips (semi-sweet)
~
Heat oven to 350F (175C). Line 12 cup muffin tin with paper liners. Combine butter, sugar, vanilla, salt, sour cream, and egg; mix well. Stir in baking soda and baking powder. Add flour and stir until just combined; stir in chocolate chips. Fill prepared muffin tin three-fourths full. Bake for 18 to 20 minutes or until muffins test done. Cool in pan or wire rack.