Cream of Broccoli Soup With Sizzled Turmeric Croutons

Name: Cream of Broccoli Soup With Sizzled Turmeric Croutons
Ingredients: Cream of Broccoli Soup; 3 tablespoons extra-virgin olive oil, plus more for serving; 3 celery stalks, roughly chopped; 6 scallions, trimmed and roughly chopped (both tops and bottoms); 1 shallot, peeled and roughly chopped; 3 garlic cloves, peeled and smashed; Kosher salt and freshly ground pepper; 1 tablespoon white miso; 1 1/2 pounds frozen broccoli, any variety; 4 1/2 cups vegetable broth or water (or a roughly 50/50 mix of both); 1 3/4 cups cooked white beans (from one 15.5-ounce can), drained and rinsed; 3 cups packed baby arugula or spinach; 2 teaspoons freshly squeezed lemon juice, plus more to taste; 3/4 cup plain Greek yogurt, plus more for serving; Sizzled Turmeric Croutons; 2 tablespoons extra-virgin olive oil; 1 1/2 teaspoons ground turmeric; 3 large slices crusty bread (6 ounces), torn (crust and all) into bite-sized pieces (yielding about 3 cups in total)