Heat oil in large skillet(s), brown chicken on both sides for 4 minutes
Remove chicken from heat and place in a crockpot
Mix sauce ingredients and pour over the top of chicken in crockpot
Cover and cook on high for 1 hour and then reduce to low for 5 to 6 hours or until easily shredded with two forks
Stir shredded chicken back into sauce and serve on buns