1 stick (1/2 cup) of butter
2 oz. (2 squares) unsweetened baking chocolate
1 cup sugar
1 cup flour
1/2 tsp salt
1/2 tsp baking soda
1/2 tsp vanilla or peppermint extract
1 cup chocolate chips
1 cup powdered sugar
1 Tbsp (or more) milk
1/2 tsp peppermint extract
Melt the butter and the unsweetened chocolate. (You can put them in a stainless steel bowl and stick it in the oven while it's preheating.)
When the bowl is cool, add the sugar, beat in the eggs, mix in the flour, the salt, and the baking soda. Add the vanilla. Spread into a greased jellyroll pan (that is, 11x17). It won't be trivial; you'll have to use a knife or something to spread it smoothly into all four corners.
Sprinkle with the chocolate chips, and bake at 350 F for 8 minutes or so.
Glaze: Mix up the ingredients. It should be like a glaze that will pour, thickly. Add a couple of drops of food coloring if desired. When the cookies come out of the oven, spread the glaze. Cool slightly, and cut while still warm. (If you wait too long, the glaze will crack when you try to cut the cookies.)