Master Muffin Recipe

and 3/4 cups (220g) all-purpose flour

baking powder

baking soda

salt

ground cinnamon

or 1 stick) unsalted butter, softened to room temperature

packed light brown sugar (or granulated)

large eggs, at room temperature

sour cream or plain yogurt

and 1/2 teaspoons pure vanilla extract

milk (any kind)