Preheat oven to 350°F. Spray 3 inch square baking pan with vegetable oil cooking spray. In medium saucepan, over low heat, combine margarine, 1 cup of the chips and water. Stir about 3 minutes, until chips are melted. Stir in sugar and vanilla. Add egg substitute; stir well.
In small bowl, combine flour, baking soda and salt; add to chip mixture, stirring until blended. Stir in remaining 1 cup chips. Pour into prepared pan.
Bake 25 minutes, or just until brownies begin to pull away from sides of pan. (Do not over-bake.) Cool completely in pan on wire rack. Cut into 16 squares.
At serving time, place 1 brownie on serving plate. Using small melon baller, top each brownie with 3 balls of frozen yogurt. Drizzle each dessert with 1 tablespoon Chocolate Sauce.
Note: If using microwave, in medium microwave-safe bowl, place margarine, 1 cup chips and water. Microwave 1 minute at High (100%); stir until chips are melted.