To brine your chicken breasts, simply fill a large bowl with 4 quarts of warm water and ¼ cup kosher salt. Stir to combine until most of the salt is absorbed. Add the chicken breasts and let them sit in the mixture to brine for 15 minutes. Or you can also also cover the bowl and refrigerate for up to 6 hours. Remove the chicken breasts and pat dry with a paper towel when ready to use.