Spray 8 x 8" baking dish and large skillet with no-stick cooking spray. heat skillet over medium-high heat about 30 seconds. Add turkey breakfast sausage patties. Cook 12-15 minutes or until lightly browned and no longer pink in the center, turning occasionally. Drain on paper towel. Place in baking dish. Spread bread cubes over turkey. Sprinkle cheese over bread cubes.
In large bowl combine milk, egg substitute, onions, parsley, mustard and pepper. Pour into baking dish. Cover. Refrigerate 8 hours or overnight.
Heat oven to 325. Remove cover from baking dish. Bake 1 hour or until set.