In a large bowl, combine the granulated sugar and lemon zest. Use your fingers to rub the zest into the sugar, releasing its natural oils and enhancing the lemon flavor.
1 cup granulated sugar, 2 tablespoons zest lemons
Stir in the melted butter until fully incorporated. Add the vanilla extract and eggs one at a time, mixing thoroughly after each addition.
½ cup unsalted butter, 2 eggs, 1 teaspoon vanilla extract
Mix in the sour cream, milk, and lemon juice until smooth and well combined.
2 tablespoons lemon juice, ¼ cup sour cream, ¼ cup milk
Gradually add the flour, baking powder, and salt, stirring just until the batter is smooth and no dry streaks remain. Avoid overmixing.
1 ⅔ cups all-purpose flour, ½ teaspoon salt, 2 teaspoons baking powder
Pour the batter into the prepared loaf pan and bake in the air fryer at 350°F (180°C) for 25 to 30 minutes or until a toothpick inserted in the center comes out mostly clean.
While the cake cools, prepare the glaze by whisking together the powdered sugar, lemon juice, milk or cream, melted butter, salt, and vanilla extract. If needed, add a little more milk to reach a pourable consistency.
1 ½ cups powdered sugar, 1 tablespoon lemon juice, 1 tablespoon milk or cream, 1 tablespoon butter, 1 pinch salt, 1 teaspoon vanilla extract
Once the cake is completely cool, remove it from the pan and drizzle the glaze over the top, allowing it to cascade down the sides. Let the glaze set before slicing and serving. Enjoy!