Mix flour, salt, pepper, and onion powder together in a large plastic bag.
Put the chicken into the bag, 1 piece at a time and shake until coated.
Heat just enough oil to coat the bottom of your pan with oil.
Cook chicken on each side until cooked through. The time will depend on how thick your chicken is so use a thermometer if needed.
Remove chicken from the pan and then deglaze with the chicken broth. Add lemon juice. Allow to cook until the liquid reduces. You can add a bit of cornstarch if you need to thicken the sauce (I find this depends on how much flour residue was left in the pan).
Add the garlic, and capers. Taste the sauce and add salt & pepper as needed.
Pour sauce over chicken pieces and serve with mashed potatoes, rice, or pasta.