Remove the core from the cabbage. Bring a large pot of salted water to a boil.
Cover and cook cabbage for 8 to 10 minutes.
Drain and place in cold water. Peel 12 leaves for the rolls, cutting the thick vein from the leaves as necessary. Drain on towels.
Preheat the oven to 375 degrees.
Meanwhile, spray a medium saucepan with olive oil. Add onion and pepper and cook for 10 to 12 minutes, until tender.
Add quinoa, garlic, and tomato paste and sauté for 2 minutes. Add vegetable broth, parsley, thyme, salt, and pepper.
Bring to a simmer and reduce heat to low. Cover and cook for 30 to 35 minutes. Stir in zucchini and Parmesan cheese and re-cover.
Allow to sit off the heat for 5 minutes. Cool slightly and stir in the egg.
Divide the quinoa mixture among the prepared cabbage leaves. Roll up leaves to enclose the filling. Place seam side down in a casserole pan.
Top with the marinara
Bake for 30 to 35 minutes. Allow to sit for 10 minutes and serve.