Sauté onion in a tbsp of olive oil in a large soup pot over low heat for about 5 minutes.
Add 2 cloves of minced garlic and 3 bell peppers chopped into small pieces, and stir well. Sprinkle with 2 tsp of salt and 1 tbsp of Italian seasoning, turn up the heat, and sauté the veggies for about 5 more minutes. (If you are using a store-bought vegan meat product or seitan sausage, you can add it now and sauté it with the vegetables. If using my homemade vegan sausage crumbles, do not add them yet.)
Add 1 cup of washed quinoa, a 25-oz jar of spaghetti sauce, and 4 cups of water. Then stir well and simmer at medium-high heat until it begins to boil. (Taste the sauce, then add extra salt and 1 tbsp of sugar if you like; the sugar will reduce the acidity of the tomato sauce.)
Turn down the heat to low, cover the soup, and simmer for 20 minutes until the quinoa has doubled in size and is tender. (If you are using my homemade vegan sausage crumbles, add them at this time.)
Top with vegan cheese, like vegan mozzarella. Turn off the heat, cover again, and simmer for about 5 minutes, allowing the cheese to melt on top. Garnish with fresh parsley if desired.
Notes
If you are using store-bought vegan sausage or beef crumbles, you can cook them at the same time as the vegetables.
If you are using my homemade sausage crumbles, cook them separately and toss them in at the end of cooking. They will lose their flavor and some of their texture if they are boiled in with the soup.
To make the soup gluten-free, be sure to use a gluten-free sausage brand or make my TVP sausage crumbles.
Use Beyond Sausage for a gluten-free and soy-free soup.