Best Chocolate Muffins Recipe - Moist, Rich & Easy

Ingredients

• 2 large eggs
• 1 cup low fat buttermilk (see note)
• 2 teaspoons vanilla extract
• 1¾ cups all-purpose flour, spooned into measuring cup and leveled-off
• ⅔ cup natural unsweetened cocoa powder, such as Hershey's
• 1¼ cups light brown sugar, packed (be sure it is fresh with no hard lumps)
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• ½ teaspoon salt
• 1 cup semi-sweet or bittersweet chocolate chips
• 1 stick (½ cup) unsalted butter, melted and slightly cooled