This has been my birthday cake request for as long as I can remember.
Stiff butter-and-cake-mix crusts require firm downward pressure to form an even base that prevents the fluid cream cheese layer from seeping to the bottom of the 9x13 inch pan during baking. Developed in the mid-century Midwest, this style relies on a dense, cookie-like foundation topped with an ultra-rich dairy mixture.
Whipping the confectioners sugar, cream cheese, and remaining eggs for a full five minutes incorporates sufficient air to create the distinct liquid-to-solid separation as it bakes at 350 degrees Fahrenheit. Beat until the mixture reaches a completely smooth ribbon state before pouring it over the uncooked base. Watch for the edges to turn lightly golden and pull slightly away from the metal sides of the baking dish, typically between 30 and 40 minutes, ensuring the center retains its characteristic density without overcooking.