Brown hamburger with the onion; drain off fat. Mix in the garlic powder and spaghetti sauce; season to taste and heat until bubbly. Meanwhile, soften the cream cheese in a medium-size microwavable bowl for about 40-60 seconds. Stir until creamy; beat in egg and pepper with a spoon until well mixed. Blend in the spinach.
Spread half the meat mixture evenly in the bottom of a greased 8 x 8" glass baking pan. Spread spinach mixture over the meat; top with mozzarella, then the rest of the meat (it may not completely cover the top, but that's ok.) Sprinkle with the parmesan cheese. Cover with plastic wrap and vent one corner.
Microwave on HIGH for 3 minutes; then reduce to MEDIUM and cook for another 7 - 10 minutes until hot and bubbly. Let stand 3 minutes before serving. Makes 6 - 9 servings. Can be frozen.
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