Whisk together BBQ sauce and pineapple juice in a small bowl.
6 ounces store-bought BBQ sauce, 2 ounces pineapple juice
Place chicken in a sealable plastic bag or other container and pour half the BBQ mixture on top and reserve the other half for later. Toss to coat and let marinate for 2 hours up to overnight.
1 ½ pounds boneless, skinless chicken breast
Thread the marinated chicken, peppers, red onion and pineapple onto skewers repeating until each skewer is filled.
2 large green bell peppers, 1 large red onion, 1 medium pineapple
Preheat an outdoor grill over high heat.
Once hot, lightly brush each skewer with canola oil and place on the grill.
Canola oil for grilling
Cook about 4-5 minutes per side until grill marks appear and chicken is cooked through.
Remove from grill and brush with the reserved BBQ sauce mixture.