Preheat the oven to 375 degree F. Line the muffin pan with cupcake liners and keep it aside.
In a medium bowl combine the dry ingredients together; flour, baking powder, baking soda, and salt.
In a large bowl combine the wet ingredients; whisk the melted butter and sugar.
Crack the eggs and combine with the wet ingredients. Add in the vanilla, sour cream, and milk.
Gently fold in the dry ingredients to the wet ingredients.
In a small bowl with a teaspoon of flour coat the chocolate chips and toss it. Fold the chocolate chips into the batter.
With the help of an ice cream scooper; scoop the batter equally into 12 muffin liners. Bake in the preheated oven for 20 to 25 minutes, until a toothpick inserted into the center comes out clean.
Place the muffins on a wire rack and serve them once cool down.