Spinach Lasagna

Ingredients

• 3 oz. sliced pepperoni (optional)
• 1 lb. lean ground beef
• 2 jars (15 1/2 oz. each) spaghetti sauce
• 1 can tomato paste
• 1 can mushroom stems and pieces, drained
• 1/4 c. chopped onion
• 1/2 tsp. dried oregano
• 8 oz. cooked lasagna, rinsed and drained
• 1/2 c. grated Parmesan cheese
• 1/4 tsp. garlic powder
• 1/2 tsp. dried parsley flakes
• salt and pepper to taste
• 1 lb. curd cottage cheese
• 3 c. Mozzarella cheese, divided
• 3 oz. grated Romano cheese
• 1 egg, lightly beaten
• 1 pkg. frozen chopped spinach, thawed and squeezed dry