Adapted from Epicurious.
3/4 cup unsweetened flaked coconut
3/4 cup pecans, chopped
1/4 cup packed brown sugar
1/8 teaspoon salt
2 tablespoons unsalted butter, melted
For brownie layer
1 1/4 sticks (10 tablespoons) unsalted butter
1 1/3 cups granulated sugar
1 1/2 teaspoons vanilla
3 large eggs
2/3 cup all-purpose flour
1/4 cup unsweetened cocoa powder
1/2 cup semi-sweet chocolate melted
1/2 teaspoon baking powder
1/2 teaspoon salt
In a 1 1/2-quart bowl stir together topping ingredients until combined well.
Make brownie layer:
In a 1 1/2-quart saucepan melt butter over moderately low heat. Melt in semi-sweet chocolate and stir frequently. Remove pan from heat and stir in sugar and vanilla. Add eggs, 1 at a time, beating well with a wooden spoon after each addition. Into a bowl sift together flour, cocoa powder, baking powder, and salt and stir into butter mixture until just combined well.
Spread batter evenly in pan and sprinkle with topping. Bake brownies in middle of oven 30 to 35 minutes, or until a tester comes out with crumbs adhering to it. Cool brownies for 20 minutes or so before eating.