In a large bowl, beat the baby food, sugar, sugar blend, egg substitute, water, oil and vanilla until well blended. Combine the cocoa, flours, baking soda and salt; gradually beat into prune mixture until blended. Transfer to a 13x9-in. baking dish coated with cooking spray.
Bake at 350° for 20-25 minutes or until a toothpick inserted in the center comes out clean. Sprinkle with chips. Cool on a wire rack.