Step 1

Preheat the oven to 350℉ and grease with butter an 8x4-inch loaf pan or spray with cooking spray.

Step 2

Whisk together flour, baking powder, and salt in a large bowl. In a separate bowl or large glass measure, whisk together sugar, melted butter, eggs (one at a time until fully incorporated), and vanilla. Then, whisk in the sour cream.

Step 3

Pour the wet ingredients into the flour mixture and whisk together until the flour is incorporated, but be careful not to overmix. Pour the batter into the prepared loaf pan.

Step 4

Bake for 40-50 minutes or until a toothpick inserted into the center comes out mostly clean. If needed, tent a piece of foil over the cake toward the end of baking if it browns too quickly. Let the cake cool in the pan for 15 minutes before removing from the pan to cool completely before slicing.

Step 5

Whisk together powdered sugar and water until desired consistency. Store the cake in an airtight container for up to 3 days.