Alton Brown's Cocoa Brownies have a 4 1/2-star rating on FoodNetwork.com as of 2015. Another highly rated brownie recipe is Mmm-Mmm Better Brownies, which has a 4 1/2-star rating on AllRecipes.com.
To make Alton Brown's Cocoa Brownies, beat 4 large eggs until fluffy, and then add 1 cup sugar and 1 cup brown sugar. Mix to combine, and then add 8 ounces melted butter, 1 1/4 cups cocoa, 2 teaspoons vanilla extract, 1/2 cup flour and 1/2 teaspoon kosher salt. Mix well, then pour the batter into a greased and floured 8-inch square pan. Bake for 45 minutes at 300 F. The brownies are done when a toothpick inserted into the center comes out clean. Cool completely before cutting.
To make Mmm-Mmm Better Brownies, begin by mixing together 1 cup sugar, 1/2 cup vegetable oil, and 1 teaspoon vanilla; beat in 2 eggs. In a separate bowl, combine 1/2 cup flour, 1/3 cup cocoa powder, 1/4 teaspoon baking powder and 1/4 teaspoon salt. Gradually add the dry ingredients to the wet ingredients, stirring until well combined, and add 1/2 cup chopped walnuts if desired. Spread the batter into a greased, 9-inch square pan, and bake at 350 F for 20 to 25 minutes.