Step 1: Prepare the Cake Batter

1. Preheat the oven to 325°F (163°C). Grease and flour a 9×5-inch loaf pan.
2. In a medium bowl, whisk together flour, baking powder, and salt. Set aside.
3. In a separate large bowl, cream together the softened butter and granulated sugar until light and fluffy.
4. Add eggs one at a time, beating well after each addition.
5. Mix in vanilla extract, lemon zest, and fresh lemon juice.
6. Gradually add the dry ingredients and sour cream in alternating additions, beginning and ending with the dry ingredients. Mix until just combined.

Step 2: Bake the Cake

1. Pour the batter into the prepared loaf pan and smooth the top.
2. Bake for 60-70 minutes, or until a toothpick inserted in the center comes out clean.
3. Allow the cake to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.

Step 3: Make the Lemon Glaze

1. In a small bowl, whisk together powdered sugar and lemon juice until smooth.
2. Stir in lemon zest for extra flavor, if desired.

Step 4: Glaze and Serve

1. Once the cake has cooled, drizzle the glaze evenly over the top.
2. Let the glaze set for a few minutes before slicing.
3. Serve and enjoy!