Preheat oven to 425 degrees F.

Pour the entire cake mix in a large mixing bowl.

Add eggs and oil and mix with a spoon until well blended.

Add Chocolate chips and stir until the chocolate chips are well incorporated into the mix.

Scoop out mix with cookie scoop and roll into 1 1/2 inch balls. Place on baking sheet about 1 inch apart.

Place in preheated oven and bake for 6 minutes.

While the cookies are baking, cut 10 marshmallows in half with kitchen shears.

Remove cookies from oven and place 1/2 marshmallow on top of each cookie, pressing lightly to make sure the marshmallow is 'inside' the cookie.

Place cookies back in oven for 2-3 minutes (until marshmallows start to melt).

Carefully remove cookies from oven and place on cooling rack with foil or parchment paper below.

While cookies are cooling, mix all of the ingredients for the icing in a bowl with a wisk until smooth. If the icing is too thick; add 1 tsp of milk until it is the desired consistency.

Drizzle the icing over the cookies with a spoon and add sprinkles before the icing dries. Only do 2-3 cookies at a time as the icing will dry very quickly after it is added.