Take the lemons, milk, and egg out of the refrigerator at least 1/2 hour before starting the recipe.
Preheat the oven to 400℉ and line a muffin pan with nine paper liners.
Carefully zest the lemon with a grater or Microplane. Take out a teaspoon or two for sprinkling on the muffins.
2 - 3 tablespoons lemon zest, 2 large lemons
Add the wet ingredients - milk, lemon juice, egg, oil, and vanilla extract- to a large bowl. Whisk together until it's combined.
1 large egg, 2 ounces fresh lemon juice, 1/2 cup milk, 1/3 cup vegetable oil, 1 teaspoon vanilla extract
Add the dry ingredients - flour, sugar, baking powder, baking soda, and salt- to a separate bowl. Mix the dry ingredients with a whisk.
2 cups flour, 3/4 cup granulated sugar, 2 teaspoons baking powder, 1/2 teaspoon baking soda, 1/2 teaspoon salt
Add the dry ingredients to the wet ingredients. Using a spatula, gently fold the ingredients until they are just combined. Do not overmix.
Either use a large spoon, cookie scoop or ice cream scoop and add the muffin batter to the paper liners. Sprinkle some lemon zest on the batter.
Reduce the oven heat to 375℉. Add the muffin pan to the oven and bake for 20 - 22 minutes. Check after 20 minutes, as ovens vary. Put a cake tester or toothpick into the middle of the baked muffin. If it comes out clean, the muffins are done.
Let the muffins cool in the pan for up to 5 minutes before removing them to a wire rack.
Slather with butter. Eat, smile, and enjoy.