Preheat Oven to 350 degrees
Mix 1 1/2 cups fine graham cracker crumbs with 2 Tablespoons granulated sugar and 6 Tablespoons melted butter in the pie dish and mix well with your hands. When it is well mixed, press into the bottom and sides of the pie pan as evenly as you can.
Bake for 8 minutes or until it just begins to brown. Be careful to not overbake. The warm smell of toasted graham cracker will just begin at 8 minutes.
While the crust is baking, pour the 2 cups of heavy cream into a mixing bowl. Add 4 Tablespoons of powdered sugar and the 1 teaspoon of vanilla. Whip at medium speed until the cream holds peaks. Don't overmix or you will get butter!
Pull the crust from the oven. Next you are going to spread the dulce de leche onto your crust. If your dulce de leche is too thick to spread or pour easily, heat it in the microwave in a glass dish for 1-3 minutes, stirring occasionally. Pour the 2 cups of dulce de leche into the crust. Spread evenly.
Peel and then slice the bananas into the dulce de leche and evenly cover the dulce de leche. Medium thick slices.
Use a spatula to scrape the whipped cream on top of the bananas and fully cover so that they do not turn brown.
Use a small sieve to sprinkle the cocoa on top or the cheese grater and sweetened baking chocolate for garnish
Refrigerate for up to 3 days. Do not freeze or the bananas will turn brown and mushy.