Heat lightly salted water in a cast iron skillet or Dutch oven. Boil chicken thighs and breasts until cook. Lower heat and simmer for 30 min.
Remove from heat, drain stock and reserve for later. Rough chop or pull cooked chicken into 2-3 inch pieces.
On medium heat add olive oil to Dutch oven. Pan sear chicken and remove. Add 2 T. butter and sauté onions, celery and green onions (Trinity) until onions are clear.
Add prepared blonde roux until it begins to soften. Slowly add 1 cup of the chicken stock. Stir until well blended.
Now add the 6 ounces of tomato pastes and 2 more cups of chicken stock. Mix well. Add in petite diced tomatoes, garlic, and bay leaf. Simmer on medium heat for 20 min.
Add in chicken, Cayenne pepper, and salt and pepper to taste. Simmer until mixture thickens completely into a smooth gravy. About 10 to 15 min. Top with green onions and parsley
Note: you can accomplish this same dish in a slow cooker. I recommend pan searing chopped chicken and sautéing onions, celery and bellpepper. Remember to add sliced green onions and parsley right before serving!