Try this Chocolate Turtle Cake recipe, or contribute your own. "Chocolate" and "Box cakes" are two tags used to describe Chocolate Turtle Cake.
Combine cake mix, oil, melted butter, water and half of the condensed milk until well blended. Pour half of the mixture into a greased 9x13" pan. Bake at 350~ for 30 minutes. Unwrap caramels. In double boiler, melt caramels with remaining half of condensed milk. (takes about 15-20 minutes). Pour over warm cake layer. Sprinkle with chopped pecans. Pour remaining batter on top. Bake 30 minutes or until top springs back. FROSTING: Bring butter, evaporated milk and cocoa to a boil. Add confectioners sugar and vanilla. Beat until smooth. Spread on cake. OPTIONAL: Decorate cake with whole pecans.