Make brownies: Preheat oven to 350°F Spray 8x8-inch baking pan with baking spray; set aside. Place chocolate and margarine in medium microwave-safe bowl. Microwave on HIGH for about 1-1/2 minutes or until melted. Add chili powder, habanero powder, rind and concentrate. Blend well; set aside.
Place sugar and eggs in large bowl. Beat with electric mixer on medium-high 1 minute or until light yellow color. Gradually add the flour while mixing on low until just incorporated. Add chocolate mixture; mix until well blended.
Spread batter evenly into baking pan. Bake for 28 - 30 minutes or until a toothpick comes out clean when inserted in center. Cool on rack completely before frosting.
Make frosting: Place cream cheese, Blue Bonnet and concentrate into large bowl. Beat with electric mixer on medium-high for 2 minutes or until creamy and smooth. Gradually add confectioners' sugar, beating until creamy and smooth. Frost cooled brownies. May garnish with additional grated orange rind, if desired.