Preheat oven to 350°F and spray a 9x5-inch loaf pan with nonstick cooking spray and line it with parchment, leaving overhang for easy removal.
Whisk the flour, baking powder, baking soda, and salt in a medium bowl. Set it aside.
Combine the sugar and lemon zest in another large bowl. Rub the sugar and zest together with your fingers until it is fragrant.
Beat in the eggs one at a time until light and fluffy using electric hand mixers or a stand mixer. Stir in the sour cream, lemon juice, milk, oil, and vanilla and mix until smooth.
Mix in dry ingredients just until combined—don’t overmix. Pour the batter into the loaf pan and smooth the top.
Bake in a preheated 350°F oven for 55–60 minutes, or until a toothpick comes out clean. Cool the Lemon Loaf in the pan 20 minutes, then lift onto a wire rack. Let cool completely.
Whisk powdered sugar with lemon juice until smooth. Add more juice to thin if needed.
Drizzle glaze over cooled cake and let it set for 30 minutes before slicing.
Notes
Chef Jenn’s Tips
Rubbing the zest into sugar really brings out the lemon oils—don’t skip it.
Use fresh lemon juice, not bottled, for the brightest flavor.
For easy slicing, let the glaze fully set before cutting.
Store leftovers tightly wrapped or in an airtight container to keep the cake moist.