1. Preheat oven to 350°F. Spray 8-inch square baking pan with nonstick cooking spray; set aside. Melt chips in top of double boiler over simmering water.
2. Combine brown and granulated sugars, baking powder and salt in large bowl. Add egg substitute, prunes and vanilla; beat 2 minutes with electric mixer at medium speed until well blended. Stir in oats, milk powder, wheat germ and chocolate.
3. Pour batter into prepared pan. Bake 30 minutes or until toothpick inserted in center comes out clean. Cool completely in pan on wire rack. Cut into 16 (2-inch) squares. Dust with powdered sugar before serving.