Holiday Brownies

1 box brownie mix
water, oil, egg called for on brownie mix box
2 or 3 drops of green food color
2/3 cup vanilla frosting
decorating decors red and green candy sprinkles or mini candy coated baking bits
mini 2 inch candy canes, unwrapped
                                       
Heat oven to 350°F (325°F for dark or nonstick pan). Line 9-inch square pan with foil so foil extends about 2 inches over sides of pan. Grease bottom only of foil with cooking spray or shortening. 
Make and bake brownie mix as directed on box. Cool completely, about 1 1/2 hours. Remove brownie from pan by lifting foil; peel foil away. To cut brownie into triangles, cut into 3 rows. Cut each row into 5 triangles, see diagram. Save smaller pieces for snacking.                                
Stir food color into frosting. Spoon frosting into small resealable food-storage plastic bag; partially seal bag. Cut off tiny bottom corner of bag. Squeeze bag to pipe frosting over brownies. Sprinkle with decors.
Break off curved end of candy cane; insert straight piece into bottoms of triangles to make tree trunks.