Vegetable and Quinoa Stuffed Zucchini

olive oil

medium onion, finely diced

medium red pepper, finely diced

Roma tomatoes or ½ C. grape tomatoes, finely diced

medium zucchini, halved lengthwise

sprigs fresh thyme leaves

salt and pepper

baby spinach leaves, chopped

cooked red quinoa

large fresh basil leaves, torn

Parmesan, grated (optional)

mozzarella, grated