Brownie Bottom Chocolate Mousse Pie

Name: Brownie Bottom Chocolate Mousse Pie
Prep time: 30 min
Cook time: 35 min
Total time: 1 h 5 min
Cuisine: American
Ingredients: 1/4 cup unsalted butter; 2 Tbsp low fat buttermilk; 1 1/2 cups chocolate chips; 1 extra large egg; 1/2 cup brown sugar; 1 tsp vanilla extract; 1/2 cup all purpose flour; 1/4 tsp baking soda; Pinch salt; 4 oz bittersweet baking chocolate; 1/4 cup water (split in two); 1 Tbsp unsalted butter; 1/2 tsp vanilla extract; 2 egg yolks; 3 Tbsp sugar; 3/4 cup heavy whipping cream; 12 Oreo cookies (crushed)