Preheat oven to 400 degrees and place mini cupcake liners in baking pan and set aside.
In a medium bowl, whisk together flour, baking powder, baking soda, salt and cinnamon and set aside.
2 1/4 cups flour, 2 teaspoons baking powder, 1/2 teaspoon baking soda, 1/2 teaspoon salt, 1/2 teaspoon ground cinnamon
Cream the butter and sugar until light and fluffy.
1/2 cup butter, 1 cup granulated sugar
Add eggs 1 at a time and then add vanilla, and then sour cream and mix well.
2 eggs, 2 teaspoons vanilla, 1/4 cup sour cream
Add the flour mixture and the buttermilk alternating and ending with the buttermilk.
1 cup buttermilk
Stir in the chocolate chips reserving some to sprinkle on top.
1 cup mini chocolate chips
Add the batter to the lined muffin tins and bake for 10 minutes.
Allow muffins to cool in pan for 10 minutes before removing to a cooling rack.