For Brownie Pie: Mix eggs, cocoa powder, sugar and vanilla until well mixed ( mix slowly, otherwise you will have a face full of cocoa powder - you can guess how I learned about that). Pour into crust and bake in 400 degree oven for 45 minutes or just until the center of the pie is set. Allow pie to cool to room temperature. For coconut topping: Whisk together evaporated milk, brown sugar, eggs and butter. Whisk constantly until smooth, thick and golden brown. Remove from heat and add coconut and pecans. Spread over the brownie layer and allow pie to cool to room temperature. You can also refrigerate it if you desire.