A delightful twist on a classic dish.
1 box chocolate cake mix (plus ingredients called for on the box)
1 cup hot cocoa mix (divided, plus extra for garnish)
1 can sweetened condensed milk (14 oz)
1 cup heavy whipping cream
1/4 cup powdered sugar
1 teaspoon vanilla extract
Mini marshmallows (for garnish)
Chocolate shavings or chips (for garnish)