Heat oil in large skillet over medium heat on stove.
Stir flour and salt together on a plate.
One by one, dip chicken breast into flour mixture and then add to hot skillet.
Let chicken cook over medium-high heat for 15 minutes. Turning occasionally.
Stir together undrained pineapple, barbecue sauce, cornstarch, brown sugar and mustard. Pour over chicken in skillet
Cover skillet and let cook on low heat for 30-40 minutes.
Garnish with sliced bell pepper and serve over rice.