1 box Funfetti Moist Surpreme cake mix (use vanilla, white, butter, or yellow as alternates)

1/2 cup unsalted butter (1 stick), softened

1 large egg

1 teaspoon vanilla extract

1 tablespoon water, optional if necessary

3/4 cup shredded sweetened coconut flakes

1/3 cup semi-sweet chocolate chips

1/3 cup butterscotch chips

1/3 cup white chocolate chips

1 can (14-ounces) sweetened condensed milk

1/3 heaping cup (just shy of 1/2 cup) cookie butter spread*