Using an electric handheld or stand mixer fitted with the paddle attachment, cream the butter and granulated sugar on medium speed for about 3 minutes until light and fluffy. Scrape down the sides and up the bottom of the bowl as needed.
1/2 cup (114g) unsalted butter, 1 cup (200g) granulated sugar
Add in the eggs one at a time, mixing well in between. Again, scrape as needed.
3 large eggs
Then mix in the lemon zest, lemon juice, vanilla extract and sour cream. The mixture will look curdled, but that's ok, it will come together when you add in the dry ingredients.
Stir in the dry ingredients in two equal parts until just combined. Spoon the batter into the prepared loaf pan.
Bake for 55-60 minutes or until a toothpick inserted into the center comes out clean. Let cool completely before glazing.
To prepare the glaze: whisk all the ingredients together until smooth and pour over the cake. Slice and serve.
1 cup (125g) powdered sugar, 1 Tbsp lemon juice, 1 Tbsp milk or cream
Notes
How to store:
Place in an airtight container or tightly wrap in saran wrap and store at room temperature for up to 3-4 days or in the fridge for up to a week.
How to freeze:
Do not glaze and allow the cake to completely cool. Double wrap in aluminum foil or saran wrap and store in the freezer for up to 3 months. Thaw overnight in the fridge and bring to room temperature before glazing and serving.