Preheat your oven to 350 degrees. Grease and flour a bundt cake pan.
Combine flour and baking powder in a large bowl. Whisk together and set aside.
3 cups all-purpose flour, 2 teaspoons baking powder
In the bowl of your stand mixer (using the paddle attachment), combine one cup butter, sugar, eggs, vanilla, and lemon zest.
1 cup unsalted butter, 2 cups sugar, 6 large eggs, 2 teaspoons vanilla extract, Zest of one lemon
Mix at medium speed until all ingredients are combined.
Add sour cream and 4 tablespoons of lemon juice. Mix until well blended.
2 tablespoons lemon juice, freshly squeezed, 1 1/4 cups sour cream
Turn the mixer to low and add about ¼ of the flour mixture, followed by ½ of the sour cream mixture, then another ¼ of the dry mixture. In between each addition, be sure to mix the ingredients until incorporated. Repeat until all the ingredients have been added. (If using a hand mixer, see notes below)
Pour batter into your bundt pan, and smooth out the top so that it’s spread evenly.
Bake at 350 for 55-60 minutes, until an inserted toothpick in the middle of the cake comes out clean.
Allow the pound cake to cool for about 10 minutes in the pan, then flip it onto a wire rack or cake plate before glazing.