preheat oven to 400°. line muffin pan with cups or spray

mix flour, sugar, and baking powder together. whisk to aerate

in a dry 1 cup measurer, add the egg and oil. fill the rest of the cup up with milk until it is full. add to the flour mixture and mix well

melt butter and add to the batter. then fold in blueberries and lemon zest

fill muffin cups to desired amount. you can sprinkle the tops with a little sugar fit extra sweetness

bake for 20 to 25 min, or until golden browned