Double Chocolate Chunk Muffins

Bahan-bahan (12 porsi)

• 2 cups flour (all purpose or plain)
• 3/4 cup unsweetened cocoa powder (or dutch process for richer muffins )
• 3/4 cup light brown sugar (packed)
• 3/4 cup white granulated sugar
• 3 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 8 oz semi-sweet dark chocolate ( or milk chocolate, roughly chopped and divided)
• 2/3 cup cooking oil
• 2 large eggs (at room temperature)
• 3/4 cup sour cream
• 3/4 cup buttermilk
• 1 tablespoon pure vanilla extract