Step 1

Generously grease a 9- by 5-inch loaf pan with butter or nonstick oil spray.

Step 2

First, make the cake. Whisk together the flour, baking powder, baking soda, and salt together in a large bowl.

Step 3

Combine the sugar and butter in a second large bowl or stand mixer. Beat with a hand mixer or the paddle attachment until light and fluffy.

Step 4

Beat the eggs into the butter mixture one at a time. Beat in the sour cream, lemon juice, lemon zest, vegetable oil, lemon extract, and vanilla extract until combined.

Step 5

Add the dry ingredients and mix until just combined. Do not overmix.

Step 6

Pour the batter into the prepared pan. Gently tap the pan on the counter to remove air bubbles.

Step 7

Transfer to the oven and bake until a toothpick inserted into the center comes out clean, 50 to 60 minutes. (The total baking time depends on the size of the loaf pan.) Remove from the oven and let cool completely before removing from the pan.

Step 8

Once the cake has cooled, make the glaze by whisking together the powdered sugar, lemon juice, and lemon zest in a large bowl until smooth. Drizzle over the cake. Slice and serve.