Season chicken breasts with salt and pepper. Heat half of the butter in a skillet over medium heat. Sear chicken on both sides until golden-brown. Remove and set aside.
In the same skillet, add remaining butter. Sprinkle in flour and whisk continuously. Slowly whisk in the chicken broth, simmering until thickened.
Stir in heavy cream, onion powder, and garlic powder. Let simmer on low heat until sauce is creamy.
Bring 2 cups of water to a boil in a saucepan. Add rice and a pinch of salt. Cook as per instructions until water is absorbed.
Return chicken to skillet with sauce. Cover and let simmer for about 15 minutes until chicken is cooked through.
Serve chicken over rice, pouring sauce generously on top. Garnish with parsley.
Notes
Leftovers can be stored in the fridge for up to three days or frozen for longer storage. Reheat slowly to maintain sauce texture.