Recipe Review - The Best Banana Cake

I know, I know, another cake recipe already? First of all, who can get enough cake, anyways? Besides, this one is my mom's favorite and today is her birthday! Since I was making it anyways, I thought I might as well share the goodness here too!

Best Banana Cake 

Cake Ingredients - 1 pkg yellow cake mix, 3 eggs, 1/2 c milk, 3/4 tsp baking soda, 1 c mashed banana.
Frosting Ingredients - 8oz cream cheese (room temp), 1 stick butter (room temp), 2 c powdered sugar, 2 Tbsp milk, 1 tsp vanilla

Mix cake ingredients together, and pour into lightly greased 13x9 glass pan. Bake according to box cake mix's directions, typically 350 degrees for 30 minutes or so.
Mix frosting ingredients together until smooth. Spread on slightly warm or cooled cake. Keep leftovers, if there are any, in the fridge.