Preheat oven to 325 degrees F. Spray a 13x9 baking dish with baking spray. Set aside.
In a mixing bowl, combine cake mix, softened butter, and egg. Beat until combined, and crumbly.
Pour into baking dish and press with palm of hand to create a firm crust.
In a mixing bowl, beat cream cheese, powdered sugar, vanilla, and eggs. Beat for about 3-4 minutes, scraping down sides of bowl as need.
Pour over crust.
Bake for 40-45 minutes until lightly browned. Remove and cool completely. Refrigerate for 4 hours. Sprinkle with powdered sugar before serving. ENJOY.
Notes
Use baking spray in your dish to prevent the gooey cake bars from sticking!
Make sure to let your butter and cream cheese come to room temperature. This is important!
Be sure to mix the filling layer well. Much like frosting, or a cheesecake, you want the cream cheese incorporated into the egg and powdered sugar. Beat for several minutes!
Top with powdered sugar. For whatever reason this cake looks very naked and bland. Top it with some powdered sugar to add a sweet decorative touch!
STORAGE: Keep cake in airtight container at room temperature for up to 4 days, or refrigerate for up to one week.