Here's what you'll need:
1 box yellow cake mix
1/2 cup butter
1 14oz can sweetened condensed milk
12oz chocolate chips (1 1/2 cups)
Mix the cake mix, butter and egg together and spread in a greased 9x13 pan. leave 1/2 cup out for latter.
Melt the chocolate and sweetened condensed milk together and spread over the cake mix
Use the 1/2 cup cake mix and place drops of cake mix over the chocolate
Bake at 350 for 20-25 min (until edges of drops are golden brown) allow to cool for 5-10 min.