For the glaze (optional):
Preheat oven to 400°F. Line a muffin pan with paper liners or grease with butter and flour (see Notes).
Add butter to a small saucepan over medium heat. Let it melt and cook until it turns golden brown, stirring constantly so it browns evenly and doesn't burn. This will take about 5 minutes. Pour the butter into a medium bowl to cool mostly to room temperature.½ cup (113 grams) butter In a large bowl, rub the lemon zest with sugar until thoroughly combined. Stir in the flour, baking powder, baking soda, and salt. ¾ cup (150 grams) granulated sugar, 2 tablespoons lemon zest, 2 cups (260 grams) all-purpose flour, 2 teaspoons baking powder, ¼ teaspoon baking soda, ½ teaspoon salt To the cooled browned butter add the buttermilk, eggs, lemon juice and vanilla extract. Add to the dry ingredients and stir until almost combined, then fold in the poppy seeds.¾ cup (170 grams) buttermilk, 2 large eggs, ¼ cup lemon juice, 1 teaspoon vanilla extract, 2 tablespoons poppy seeds (Optional) Cover batter with plastic wrap and let it rest for 30 minutes while leaveners activate.
Spoon into the prepared muffin pan, filling to the tops of the liners. Sprinkle with additional sugar.
Bake until lightly golden and tops bounce back when gently pressed with a finger, 16-18 minutes. Let cool in the pan for a few minutes, the pop out onto a wire rack to cool completely.
To make the glaze, stir together the powdered sugar and enough lemon juice to make a thick icing. Pour over the tops of the cooled muffins and let them set up for a few minutes before serving1 cup (113 grams) powdered sugar, 1-2 tablespoons lemon juice Store these muffins in an airtight container for up to 3 days. You can also freeze them in a ziplock bag for up to a month or more. Thaw at room temperature.
- To get the tallest rise, only fill every other muffin cup in your pan (so only 6 in a regular 12-cup muffin pan). This gives the muffins plenty of heat and room to grow to their full height.
- Letting the batter rest also helps with rise. You can prepare the batter even farther ahead, chilling it in the fridge for up to 18-24 hours before baking.
Calories: 260kcal, Carbohydrates: 40g, Protein: 4g, Fat: 10g, Saturated Fat: 5g, Cholesterol: 49mg, Sodium: 52mg, Potassium: 131mg, Fiber: 1g, Sugar: 23g, Vitamin A: 301IU, Calcium: 77mg, Iron: 1mg