Prep Time: 15 minutes
Cook Time: 40 minutes
Total Time: 55 minutes
Servings: 6
Heat oven to 400ºF.
Prepare stuffing as directed on package. Add 1 egg; mix well. Press onto bottom of 9-inch square baking dish sprayed with cooking spray; sprinkle with 3/4 cup cheese.
Cook and stir onions in medium nonstick skillet sprayed with cooking spray 5 min. or until tender. Remove from heat; stir in spinach. Spoon half the spinach mixture over cheese layer in baking dish; top with peppers. Cover with layers of remaining cheese and spinach mixture. Beat remaining eggs; pour over ingredients in baking dish. Top with tomatoes.
Bake 35 to 40 min. or until center is set.