These are freezer bars. I tend to make them in a square baking dish.

if you're having trouble getting the chocolate mixture to blend properly, turn your high-speed blender off and insert a spatula down one side to let a pocket of air down near the blades. Then remove the spatula, put the lid back on and continue blending--going from slow all the way up to fast again.

You must use the coconut oil in this recipe. It's what makes the chocolatey mixture thicken in the freezer.