Beat 4 eggs and 1 1/2 c sugar together. Add 2/3 cup unsweetened cocoa powder and 1 cup butter. Mix in 2 cups plus 2 T flour, 1 tsp vanilla, and 3/4 tsp salt. Drop on each section of preheated waffle iron as you would for regular waffles. Bake 1-2 minutes. It's easy to over-cook these, so watch carefully. Frost with chocolate frosting:
5 T butter
1/4 c milk
3-4 T unsweetened cocoa powder