So according to my pinterest find you need something to support the ice cream cones in the oven while they bake. It suggested a foil tray.
I'm going to experiment and do 1/2 with a foil tray and 1/2 just stood up in a muffin tin
cut holes in the foil tray to support your cones - this is not as easy at it looks
Preheat your oven according to cake mix box directions