Season the chicken with salt, pepper, garlic and onion powder. Set aside.
Heat two tablespoons of butter and two tablespoons of olive oil in a braiser over medium heat. Add the chicken, cover and let sear for 3-4 minutes, or until the chicken is nicely browned. Flip, cover and continue searing for another 3-4 minutes. Remove the chicken from the braiser and set aside.
Add the onions, celery and carrots to the braiser.
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