While it bakes: Test the cake after 30 minutes, the typical test of the center of the cake being done is used, the center is firm, but by using a toothpick or skewer to test, this cake should be almost underdone! Frost as desired, using Cream cheese or butter frosting (cream cheese suggested), using this mixture. Cream Cheese Frosting: Mix the cream cheese, the milk, the vanilla, and the salt, then add the powdered sugar, one cup at a time, until it is well mixed.