Preheat your oven to 325°F (165°C). Grease and flour a bundt pan or pound cake pan.
In a large mixing bowl, cream together the butter and sugar until light and fluffy.
Beat in the eggs one at a time, then mix in the key lime juice and zest until well combined.
In a separate bowl, sift together the flour, baking powder, and salt.
Gradually add the dry ingredients to the wet ingredients, alternating with the sour cream, until everything is well incorporated.
Pour the batter into the prepared pan and smooth the top. Bake in the preheated oven for 60-70 minutes, or until a toothpick inserted into the center comes out clean.
For added sweetness and flavor, you can prepare a simple glaze by mixing powdered sugar with a few tablespoons of key lime juice. Drizzle the glaze over the cooled cake before serving.
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