Warm the olive oil in a large Dutch oven or soup pot over medium heat. Once the oil is shimmering, add the chopped onion, carrot, celery, seasonal vegetables and a pinch of salt. Cook, stirring often, until the onion has softened and is turning translucent, about 6 to 8 minutes.

Add the garlic and thyme. Cook until fragrant while stirring frequently, about 1 minute. Pour in the diced tomatoes with their juices and cook for a few more minutes, stirring often.

Pour in the quinoa, broth and the water. Add 1 teaspoon salt, 2 bay leaves and a pinch of red pepper flakes. Season generously with freshly ground black pepper. Raise heat and bring the mixture to a boil, then partially cover the pot and reduce heat to maintain a gentle simmer.

Cook for 25 minutes, then remove the lid and add the beans and the chopped greens. Continue simmering for 5 minutes or more, until the greens have softened to your liking.

Remove the pot from heat, then remove the bay leaves. Stir in 1 teaspoon lemon juice. Taste and season with more salt, pepper and/or lemon juice until the flavors really sing. (You might need up to ½ teaspoon more salt, depending on your vegetable broth and your personal preferences.) Divide into bowls and top with grated Parmesan if you’d like.