Skinny Slow Cooker Kale and Turkey Meatball Soup

Name: Skinny Slow Cooker Kale and Turkey Meatball Soup
Ingredients: ¼ cup milk; 2 slices bread; 1 pound lean ground turkey (85% lean); 1 medium shallot, finely chopped; 2 cloves garlic, finely chopped; ½ teaspoon freshly grated nutmeg; 1 teaspoon oregano; 1/4 teaspoon red pepper flakes; kosher salt and freshly ground pepper; ½ cup Parmigiano-Reggiano, grated, plus more for garnish; 2 tablespoons Italian parsley, chopped; 1 egg, beaten; 8 cups chicken or vegetable broth (64 ounces); 1 15-ounce can white Northern beans or other small white bean, drained and rinsed; 2 carrots, sliced; ½ yellow onion, chopped; 4 cups kale (about 1 pound)