Two butter layers. Two!!
Layer One:
1-18.25 oz. yellow cake mix
1 egg
1 cube butter, melted
Layer Two:
1-8 oz. pkg. cream cheese, softened
2 eggs
1 t vanilla
1 cube butter, melted
3 3/4 c powdered sugar
Layer one: Prepare 24 cupcake tins with paper liners. Combine cake mix, egg, and butter. Beat with electric mixer until combined. Dough will look a lot like sugar cookie dough. Roll dough into a 1-inch ball and flatten in your hand. Place in bottom of cupcake paper. Repeat until all 24 cupcake papers are full.
Layer two: in large bowl, beat cream cheese until smooth. Add eggs, vanilla, and butter. Beat until well-mixed. Add powdered sugar and beat again until well-mixed. Pour 1/4 cup onto each first layer in the cupcake tins. Bake at 350 for 17 minutes. Centers should be gooey.