Boil pasta according to packaging instructions. Preheat oven to 350 degree F. In a skillet add oil and leeks and cook for at least 5 minutes until the leeks a bit tender. Add garlic, onions, and red peppers and cook for 4 - 5 minutes. Add mushrooms, drops of lemon juice, oregano, basil and black pepper and cook for another 5 minutes stirring occasionally. Remove from heat and set aside.
In a saucepan under medium heat, add marinara sauce, nutmeg, mozzarella cheese and creamy swiss cheese. Heat up sauce to start melting cheese for only 3 - 5 minutes. Do not melt cheese entirely - you only need to create a creamy sauce with chunks of cheeses.
In a large bowl, mix pasta, vegetables and sauce with cheese together until well incorporated. Transfer to a prepared baking dish, top with parmesan cheese and mozzarella cheese and bake in a 350 degree F for 30 minutes until top is crispy. Serve hot .
Baked Vegetable Spaghetti made with wheat pasta, vegetables, cheeses and marinara sauce. This recipe can also be made with regular spaghetti.