Veggie sketti

I got inspired today and decided to create something for lunch. Yum! All veggies and so hearty I couldn't finish it! Let me know what you think.

1 onion chopped
Put into skillet with 1 T olive oil. Sauté until almost soft. Add
2 large tomatoes chopped
2 portobello mushrooms cleaned and chopped
2 large handfuls of spinach roughly chopped
1 tsp Italian seasoning
Salt and pepper to taste.

Sauté all ingredients until soft pour over bed of spaghetti squash. Top with Parmesan cheese if desired.