Start by seasoning your chicken thighs with salt, pepper, garlic powder, onion powder, and cajun seasoning of your choice.
Cook chicken over medium heat until both sides have color. You don't want to cook these all the way through. That will happen once they're re-introduced into the gumbo. Remove and set to the side.
Cut up your andouille sausage into your size of choice and brown, and brown it in your pot. Remove and set to the side.
If you have leftover bits, clean them out of your pot.
Add in your cup of flour, and cup of vegetable oil. This will be for your roux. You will want to cook this on low heat.
Continually whisk this mixture for around 30 - 45 mins. The goal here is to take this roux to a chocolate color, and to not let it burn. You can cook this on medium low, but make sure to keep an eye on it.
Once this roux has taken on a color that looks like milk chocolate, dump in your diced veggies. Be careful during this stage, because it will immediately active the roux, and it will start cooking fast. Have your chicken broth on hand so that you can pour it into the mixture fairly quickly.
Now that you have your veggies into the roux, dice up your chicken thighs, and add them to the pot, along with the andouille sausage.
Add more seasoning to taste, and your bay leaves. Reduce heat to low.
Let your covered gumbo simmer 30 minutes, and begin to cut your okra into small pieces. This will be used to thicken your gumbo.
Once you feel like your gumbo is tasting right, and has simmered for a while, add in your okra and let it go for 3 - 5 minutes. At this point it should have started to thicken.
Your good to go! Spoon this over some white rice and enjoy!