Cajun Chicken and Sausage Gumbo

• ⅓ cup butter
• ¼ cup all-purpose flour
• 1 cup sweet onion, chopped
• 1 cup red bell pepper, chopped
• 1 cup yellow bell pepper, chopped
• 2 celery, chopped
• 1 ½ cups smoked andouille sausage, sliced, approximately 3 links
• 2 cloves garlic, minced
• 1 tsp dry mustard powder
• 1 tsp cayenne pepper
• 1 ½ tsp paprika
• 1 tsp garlic powder, or granulated garlic
• 1 tsp cajun seasoning, or creole seasoning
• 4 cups chicken stock
• 2 ½ cups cooked chopped chicken
• 1 bay leaf
• 1 cup frozen okra, chopped
• 1 tsp kosher salt
• 1 tsp black pepper
• 2 cups cooked white rice, optional, for serving

Converted amounts are rounded.