Healthy Lasagna Recipe

• 1 tsp oil to grease the dish
• 250 g mushrooms (e.g. button, cup, brown), sliced
• 1.2 kg crushed or diced tomatoes
• 1 tbsp dried oregano
• 4 cloves garlic, crushed
• 1 tsp salt
• 250 g no boil pasta sheets
• 700 g ricotta cheese
• 400 g frozen or fresh spinach. If frozen, thaw and break up if needed.
• 0.5 cup milk
• 100 g mozzarella cheese
• 70 g parmesan cheese