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.