Preheat your oven to 325°F and grease your Bundt pan very thoroughly with butter and a dusting of flour. Make sure you get into every single nook and cranny so the beautiful cake releases perfectly after it finishes.

In a medium bowl, whisk together the all-purpose flour, baking soda, and salt until they are very well combined. Sifting or whisking helps to aerate the flour which ensures your pound cake has a very tender crumb.

In a large mixing bowl, beat the softened butter and granulated sugar together for at least five full minutes. The mixture should look very pale, fluffy, and almost like whipped cream before you move to the next step.

Add the eggs one at a time, beating well after each addition until the yellow yolk is fully incorporated. This slow process helps build a strong structure so your heavy pound cake does not collapse in the oven.

Stir in the fresh Key lime zest, 1/4 cup of lime juice, and the vanilla extract using a low speed. You will immediately smell the bright and refreshing citrus aroma filling up your entire kitchen and your cozy home.

Alternate Flour and Cream Add the flour mixture and the sour cream to the batter in three separate parts, starting and ending with flour. Mix gently after each addition just until the white streaks disappear into the thick and very creamy batter.

Pour the batter into your prepared Bundt pan and smooth the top surface with a large rubber spatula today. Bake for seventy to eighty minutes until a long wooden skewer comes out clean from the center of the cake.

Let the hot cake sit in the pan for exactly ten minutes before carefully inverting it onto a rack. Allow it to cool completely to room temperature before you start drizzling the sweet and tart lime glaze over.

Whisk the powdered sugar and three tablespoons of Key lime juice in a small bowl until the mixture is smooth. Add a splash of heavy cream if you want a thicker, whiter glaze that sits beautifully on the cake.

Pour the lime glaze slowly over the top of the cooled cake, letting it drip naturally down the sides. Sprinkle a little extra lime zest on top for a beautiful pop of green color before serving to guests.