Step 1

Preheat oven to 350 degrees. Grease a 13X9X2" pan.

Step 2

Reserve 1 cup dry cake mix for filling.

Step 3

For the crust, mix together remaining dry cake mix, 1 egg, and oil (mixture will be crumbly).

Step 4

Press mixture on bottom and 3/4 way up sides of pan.

Step 5

For the filling, blend cream cheese, sugar, and cocoa in large mixer bowl.

Step 6

Add remaining 3 eggs and reserved 1 cup of cake mix. Beat 1 minute at medium speed. Turn to low speed.

Step 7

Add milk and vanilla extract.

Step 8

Mix until smooth.

Step 9

Pour filling into crust.

Step 10

Bake at 350 degrees for 55 to 65 minutes or until center is firm.

Step 11

Cool to room temperature.

Step 12

Spread Cool Whip over cheesecake.

Step 13

Refrigerate at least 1 hour before serving.