Chocolate Muffins

white all-purpose flour, (make sure to spoon and level)

special dark cocoa powder*

regular cocoa powder

baking soda

and 1/2 teaspoons baking powder

fine sea salt

mini chocolate chips

and 1/4 cup milk chocolate chips ((or semi-sweet or dark, whatever you prefer))

large eggs

white granulated sugar

light brown sugar, (lightly packed)

canola (or vegetable) oil

unsalted butter, (melted and cooled)

full fat sour cream (or full fat vanilla Greek yogurt)

buttermilk ((or regular milk mixed with vinegar/lemon juice -- see instruction #8))

vanilla extract