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Preheat oven to 425°F (218°C). Spray a 12-count muffin pan with nonstick spray or use cupcake liners. This recipe yields about 14 muffins, so prepare a second muffin pan in the same manner or bake in batches and reserve leftover batter at room temperature for when the first batch is done.
Whisk the flour, sugar, cocoa powder, baking soda, salt, and chocolate chips together in a large bowl. Set aside. Whisk the eggs, sour cream, oil, milk, and vanilla extract together until combined. Pour wet ingredients into dry ingredients and fold together with a rubber spatula or wooden spoon.
Spoon the batter into liners, filling them all the way to the top. Bake for 5 minutes at 425°F then, keeping the muffins in the oven, reduce the oven temperature to 350°F (177°C). Bake for an additional 15-16 minutes or until a toothpick inserted in the center comes out clean.
Jumbo Muffins: If you’d like to make about 6 jumbo muffins instead of standard size, follow the recipe through step 3 using a greased jumbo 6-count muffin pan. Spoon batter into the liners, filling all the way to the top. Bake for 5 minutes at 425°F then, keeping the muffins in the oven, reduce the oven temperature to 350°F (177°C). Bake for an additional 25-28 minutes or until a toothpick inserted in the center comes out clean.














