Heat oven to 350 degrees. Lightly grease 12 in. round pizza pan.
Beat brown sugar and shortening in lg. bowl until creamy. Add egg, water and vanilla; beat well.
Stir together flour, baking soda and salt; add to sugar mixture, beating on low speed of mixer until well blended.
Stir in peanut butter chips. Spread batter into prepared pan to within 1/2 in. of edge.
Bake 11 - 13 min. or until set. Remove from oven.
Sprinkle marshmallows, chocolate chips and pecans over top. Return to oven. Bake 5 - 7 min. or until marshmallows are lightly browned. Cool completely.
Prepare Chocolate Drizzle and Orange Drizzle (see below). Drizzle Chocolate Drizzle over top. Drizzle Orange Drizzle over chocolate. Let stand about 1 hr. until drizzles set. Cut into wedges.
In small microwave-safe bowl, place 1/4 cup semi-sweet chocolate chips and 1 1/2 tsp. butter flavor shortening. Microwave at med. power for 1 min.; stir. If necessary, microwave at med. an additional 15 sec. at a time, stirring after each heating, just until chips are melted when stirred.
In sm. bowl, stir together 1/2 cup powdered sugar, 1 tbs. water, 3 drops yellow food color and 2 drops red food color; stir until well blended.