Step 1: Preheat your oven to 350°F (175°C) and grease a 9x5 inch loaf pan thoroughly with butter or non-stick spray.
Step 2: In a medium bowl, whisk together the flour, baking soda, baking powder, and salt until well combined for the starbucks lemon loaf recipe base.
Step 3: In a large bowl, beat the eggs, sugar, and softened butter until light and fluffy. This should take about 3-5 minutes with a hand mixer.
Step 4: Add the vanilla extract, lemon extract, lemon juice, vegetable oil, sour cream, and lemon zest to the wet mixture and beat until smooth.
Step 5: Gradually fold the dry ingredients into the wet ingredients using a spatula until just combined. Do not over-mix your starbucks lemon loaf recipe batter.
Step 6: Pour the batter into the prepared loaf pan and bake for 45-55 minutes, or until a toothpick inserted into the center comes out clean.
Step 7: Let the loaf cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
Step 8: Whisk together the powdered sugar, heavy cream, and lemon juice to create the glaze. Pour over the cooled starbucks lemon loaf recipe and let it set before slicing.