01 -
Preheat oven to 350 degrees F and grease a 9x9-inch baking dish.
02 -
In a large mixing bowl, add sugar and melted butter. Mix for 1 minute or until light and airy. Add eggs one at a time, followed by the vanilla extract.
03 -
In a small bowl, sift together the flour, baking powder, and salt. Slowly add dry mixture to the wet ingredients until just combined.
04 -
Fold in sour cream until fully incorporated into the batter.
05 -
Transfer batter to the prepared baking dish and sprinkle remaining granulated sugar on top. Bake for 30-35 minutes or until an inserted toothpick comes out clean.
06 -
Allow cake to cool completely before slicing and serving.