Preheat oven to 425 degrees Fahrenheit
Combine wet ingredients in mixer: melted butter, oil, eggs, sour cream, milk, vanilla extract, sweetner
Add dry ingredients to mixer with the wet ingredients: flour, baking powder, baking soda, salt
After ingredients are well mixed gently add in chocolate chips
Line baking muffin pan with liners, butter or oil
Scoop batter into each muffin spot filling about 2/3 to 3/4 full
Bake at 425 degrees Fahrenheit for 5 minutes
Reduce temperature to 350 degrees Fahrenheit
Continue baking for about 15 minutes or until golden brown and toothpick comes out clean
Remove from oven and allow to cool for 10 minutes
Serve with a glass of milk
Store leftovers in container or gallon ziplock bag