Lasagna, Cheese-Spinach II

Ingredients

• 9 lasagna noodles, cooked according to package instructions
• 1 400ml (14-oz.) can tomato sauce
• 1 150ml (5-oz.) can tomato paste
• 15ml (1 tbsp.) oil
• 1 250g (1/2 lb.) small can mushrooms, OR fresh
• 1 onion, chopped
• 1 clove garlic, chopped (optional)
• Salt and pepper to taste
• 15ml (1 tbsp.) oregano
• 1 egg
• 1 300g (10-oz.) package frozen spinach, thawed, drained, OR 10 oz. fresh spinach, cooked, chopped, drained
• 250ml (1 cup) quark OR cottage cheese
• 200g (7 oz.) sliced Swiss cheese
• 75ml (1/3 cup) grated Parmesan cheese (if kosher available)