Step 1

Preheat oven to 350 degrees F.

Step 2

Take the cake mix, 1 egg, and softened stick of butter and mix together.

Step 3

Pat down into a 9x13 pan.

Step 4

Mix together remaining eggs, cream cheese, powdered sugar, and vanilla and pour over cake.

Step 5

Bake at 350 for 10 minutes.

Step 6

Reduce heat to 325 and bake for 45-50 minutes.

Step 7

This cake will sink in the middle after it cools.

Step 8

Let cool completely before cutting. Cut into squares and place any remaining bars in the refrigerator in an airtight container (between layers of wax or parchment paper).