Serves 6 Ingredients 4 tablespoons olive oil 1 cup diced red onion 2 cups diced heirloom tomatoes 2 cups green beans 1 cup diced green bell pepper 1 1/2 cups (1/2-inch) sliced zucchini 1 1/2 cups (1/2-inch) pieces asparagus 1 cup baby spinach 1 cup parmesan cheese (or vegan cheese) 1 1/2 cups sliced…