Milk + Lemon: Preheat the oven to 425 degrees F and grease or line 6 cups of a standard muffin pan. Combine the milk, lemon juice, and lemon zest. I do this in a liquid measuring cup so the recipe only needs one mixing bowl. Set aside.
½ cup + 1 tablespoon milk of choice, 1 tablespoon lemon juice, 1 tablespoon lemon zest
Dry Ingredients: In a large mixing bowl, whisk together the gluten-free flour, poppyseeds, baking soda, baking powder, sugar and salt.
1 cup + 1 tablespoon all purpose gluten-free flour , 1 tablespoon poppyseeds, ½ teaspoon gluten-free baking powder, ¼ teaspoon baking soda, ¼ cup + 1 tablespoons granulated sugar , ¼ teaspoon salt
Wet Ingredients: Add the egg and melted butter to the milk mixture and whisk together. Then pour it into the bowl of dry ingredients. Stir until just combined but do not over mix - ideally it will be very lumpy. Allow the batter to rest for 5-15 minutes (longer makes a softer crumb).
3 tablespoons butter, 1 egg
Bake: Portion the batter evenly between the muffin cups. Bake on a middle oven rack at 425 degrees F for 7 minutes. Then lower the temperature to 400 degrees F and bake for 8-10 minutes. You can test for done-ness by inserting a toothpick in the center of a muffin to make sure it comes out dry, or with just a few moist crumbs.
Lemon Glaze: Meanwhile, in a small mixing bowl, add 1 tablespoon of lemon juice to ½ cup of powdered sugar and whisk until smooth to make a glaze. Add additional liquid (lemon juice, milk, or water will work) or powdered sugar to create your desired consistency.
1 tablespoon lemon juice, ½ cup powdered sugar
Cool: Cool for 5 minutes in the muffin pan. Then gently remove the muffins from the pan and set them on a wire cooling rack for an additional 10 minutes to cool before eating.