Butter Bean Soup

Name: Butter Bean Soup
Prep time: 10 min
Cook time: 33 min
Total time: 43 min
Cuisine: American
Ingredients: 2 Tablespoons olive oil; 2 ribs celery (diced); 2 carrots (diced); 1 large onion (diced); 2 cloves garlic ( minced); 2 Tablespoons all purpose flour (unbleached); 32 ounces vegetable broth; 2 15 ounce cans butter beans (rinsed and drained); 14 ounces diced tomatoes; 1 bay leaf (dried); coarse kosher salt; freshly ground black pepper; fresh chopped parsley (optional); fresh chopped thyme (optional); crushed red pepper flakes (optional)