Prepare your cake mix according to the package directions. Bake in a greased 9x13" pan according to the box directions (mine was 350°F for 32 mins) until a toothpick inserted comes out mostly clean. Run a knife around the edges to loosen them from the pan sides and use a fork to poke holes all over the top. Then set the pan on a cooling rack and let it come to room temperature.

In a bowl, whisk together the evaporated milk, sweetened condensed milk and whole or 2% (fill the evaporated milk can with whole or 2% milk for the right amount). Pour the milk mixture over the top of the cake. Cover the pan with foil or plastic wrap and place it in the fridge to chill for a few hours.