Light, fluffy and SUPER moist muffins filled with bit of chocolate!
Preheat oven to 400. Line muffin tin with paper cups or grease well.
Combine sour cream, milk, oil, egg, and vanilla in a large mixing bowl. Whisk until well combined.
Sift flour into a medium bowl. Add in baking soda, baking powder, sugar, salt, and cinnamon. Stir until just combined.
Add the dry ingredients to the wet ingredients and stir until just combined. DO NOT OVERMIX.
Gently fold in 2/3 cup of the chocolate chips and 1/3 cup of the chopped nuts.
Scoop the batter into each of the muffin cups filling 3/4 full.
Sprinkle each muffin with remaining chocolate chips and nuts.
Bake the muffins in the oven for 22-25 minutes or until a toothpick inserted comes out clean.
Remove the muffins from the oven and allow to cool slightly before removing them from the muffin pan. Then allow them to cool completely before storing in an air-tight container.