1. Preheat your oven to 325°F. Grease and flour a 9×5-inch loaf pan.
2. In a bowl, whisk together the flour, baking powder, and salt. Set aside.
3. In a large mixing bowl, cream the butter and sugar until light and fluffy, about 3-4 minutes.
4. Add the eggs one at a time, beating well after each addition.
5. Mix in the key lime juice, buttermilk, lime zest, and vanilla extract.
6. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
7. Pour the batter into the prepared loaf pan, smoothing the top with a spatula.
8. Bake for 60-70 minutes, or until a toothpick inserted into the center comes out clean.
9. Allow the cake to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.

Remember, it’s okay if the kitchen looks like a flour bomb went off—perfection isn’t the goal. It’s all about enjoying the process and the company.