Step 1

Preheat oven to 350 degrees F and grease a 9x9-inch baking dish.

Step 2

In a large mixing bowl, add sugar and butter. Mix for 1 minute or until light and airy.

Step 3

Add eggs one at a time, followed by the vanilla extract.

Step 4

In a small bowl, sift together the flour, baking powder, and salt. Slowly add dry mixture to the wet ingredients until just combined.

Step 5

Fold in sour cream.

Step 6

Transfer batter to the prepared baking dish and sprinkle remaining granulated sugar on top.

Step 7

Bake for 30-35 minutes or until an inserted toothpick comes out clean.

Step 8

Allow cake to cool before slicing.