Mississippi Mud Pie Ingredients Crust 40 Oreo cookies (one 15.3 oz pkg) 5 Tbsp unsalted butter, melted Flourless Chocolate Cake 6 oz bittersweet chocolate chips or chopped chocolate (1 cup. I recommend Ghirardelli) 1/4 cup unsalted butter 1/4 cup water, at room temperature 1 Tbsp unsweetened cocoa powder 1/4 tsp salt 1 Tbsp vanilla