I will say, when I have been home with a chocolate craving with no brownie mixes on hand I usually make a microwave chocolate mug cake. There's a lot of versions of the recipe out there... I have one printed out that is similar to this one:
aha! I just remembered my mom wrote it out for me when we moved! This is how we make them.
2 c sugar
1 c flour
1 1/2 sticks butter
1 tsp vanilla
4 oz. baker's chocolate
3 eggs
melt butter and chocolate in microwave for one minute. stir. then continue adding 30 seconds and stirring until melted. do NOT exceed 2 minutes. combine all ingredients. do NOT over-stir unless you want them cake-y. (we prefer gooey ones, and JUST stir until combined) line your pan with foil and then grease the foil. bake at 350 for 35 minutes
they are like the easiest thing to make and one of the first things my mom teaches us to make on our own. another fun thing to do is add the heath bar bits (you get them by chocolate chips) to it. BEST STUFF EVER. lol