Crush Graham Crackers (250 gram) with a food processor and put it in a bowl. Melt Butter (200 gram) and mix it with the crumbs. Divide the mixture in a non-stick muffin tray. Press them down with a spoon. Put the tray into the fridge for half an hour.
For the filling: Put Butter (3.5 ounce) into a sauce pan. Add in Brown Sugar (1/2 cup) and stir until the butter has melted. Add in Sweetened Condensed Milk (400 gram) and stir it in. Stir over a low heat for about five minutes.
Take the mix off the heat and stir in Milk Chocolate (100 gram). Divide mixture between the bases and return the pies to the fridge for an hour.
Take the pies out of the tray. Arrange slices of Banana (2) on top of each pie. Top with Whipped Cream (to taste) and pour Unsweetened Cocoa Powder (1 teaspoon) over them. Serve!