Slow Cooker Hearty Vegetable and Bean Soup

Name: Slow Cooker Hearty Vegetable and Bean Soup
Prep time: 5 min
Cook time: 10 h
Total time: 10 h 5 min
Cuisine: American
Ingredients: 1 sweet onion (diced); 2 garlic cloves (minced); 1 sweet potato (medium, peeled and cut into 1-inch cubes (white or red potato optional)); 2 carrots (peeled and sliced into 1 inch pieces); 2 celery stalks (diced); 1 cup whole kernel corn (optional); kosher or sea salt (to taste); 1/2 teaspoon black pepper; 1/8 teaspoon allspice; 1 teaspoon paprika; 1 bay leaf; 1/2 teaspoon crushed red pepper flakes (more or less to taste (can be substituted with cayenne pepper)); 2 cups green beans (frozen or fresh); 4 cups vegetable broth (low sodium (chicken broth can be substituted)); 1/4 cup parsley (freshly chopped); 14 1/2 ounce diced tomatoes (can); 31 ounce cannellini beans (cans - drained (navy, black, or pinto can be substituted))