Raspberry Shortcake Sheet Cake

box white cake mix, plus ingredients to make (mine said: 1 cup water, 1/3 cup oil, and 3 eggs)

pkg neufchatel cream cheese

butter

powdered sugar

tub light cool whip

box Raspberry Danish Dessert (see photo in post for reference; find in aisle with Jell-O/gelatin dessert)

cold water

pkg frozen raspberries (may use fresh as well; about 2 1/2 to 3 cups)