Cook half of the bacon until crisp. Remove and chop. In the same pan, caramelize onions until golden. Stir bacon into onions.

Season chicken breasts lightly. Spoon bacon-onion mixture onto chicken and roll tightly.

Wrap each roll with remaining bacon slices and place seam-side down in a baking dish.

Brush chicken with BBQ sauce and bake at 400°F until bacon is crisp and chicken is cooked through.