Belgian Chicken Booyah

4 pounds skinless, boneless chicken thighs, cut into 1-inch pieces
2 pounds red potatoes, cut in 1-inch pieces
1 (16 ounce) package frozen whole kernel corn
1 (16 ounce) package frozen cut carrots
1 (15 ounce) can cut green beans, drained
1 (14.5 ounce) can chicken broth
8 ounces diced celery
1 (14.5 ounce) can petite diced tomatoes
8 ounces diced onion
8 ounces diced green bell pepper
8 ounces cabbage, shredded
1/4 cup salt, or to taste
2 tablespoons dried basil
2 tablespoons dried oregano
2 tablespoons celery salt
1 tablespoon ground black pepper
1 0.42 oz packet concentrated vegetable base (such as Swanson® Vegetable Flavor Boost®) (optional)

Mix all ingredients in a slow cooker.
Cook on Low for 6 hours.