Heat 2 tablespoons olive oil over high heat in a heavy-bottom cast iron Dutch oven. Season 2 pounds boneless skinless chicken thighs liberally with Salt and black pepper. Working in batches, brown each side of the thighs for 2-3 minutes, or until just seared and browned. Make sure not to crowd the pan. Remove the thighs to a plate, and continue with remaining thighs.
Once all thighs are brown, lower heat to medium-low, then add ½ cup butter to the pot and melt completely. Add in ⅔ cup all purpose flour and stir well to combine.
Continue stirring constantly (or at least, very frequently), until the mixture is just a little darker than peanut butter, about 20-25 minutes. Make sure to scrape the "corners" of the pan to avoid any burning.
Once the roux is the right color, add in 1 large onion, 1 large green bell pepper, 3 stalks celery, and 5 cloves garlic. Cook until just beginning to soften, about 10 minutes.
Pour in 1 bottle beer, and scrape the bottom of the pan to deglaze it and get all the good browned chicken bits in the étouffée.
Add in 2 bay leaves, 10 ounces canned diced tomatoes with chiles, 3 cups chicken stock or bone broth, 1 tablespoon maple syrup, 2 tablespoons Cajun seasoning, 2 tablespoons Worcestershire sauce, and the chicken thighs. Also add in salt, pepper, and Louisiana hot sauceto taste.
Turn heat up to high, bring to a boil, then reduce heat and simmer for 45-50 minutes, or until the mixture is thick, bubbly, and the chicken thighs are falling apart. Use two forks to shred the chicken thighs if they need any help.
Serve with a big pile of Rice, plus extra hot sauce for those who like it a little bit spicier. Top with minced parsley and diced green onions.