HEAT oven to 350 degrees F. Coat bottom of an 8-inch round cake pan lightly with no-stick cooking spray.
PREPARE brownie mix as directed on package using oil, water and egg. Stir in almond extract, peanut butter and peanuts until blended. Spread batter evenly into prepared pan.
BAKE 40 to 42 minutes or until a toothpick inserted in the center comes out clean. Cool 10 minutes. Remove from pan to wire rack to cool completely.
PLACE cake on serving platter. Stir fudge topping until smooth. Spread over cake, covering top and sides. Place the tip of a frosting knife at the center of cake, pulling the knife toward the outer edge in a slight arc. Turn cake a notch counter clockwise. Repeat knife pull several times to form a pattern around entire cake. Garnish center of cake with mint, if desired.