Step 1: Prepare the Oven and Baking Dish
Preheat your oven to 400°F.
Lightly spray a baking dish with oil to prevent sticking.

Step 2: Season the Chicken
Place the chicken breasts into the baking dish in a single layer. Sprinkle both sides with salt and black pepper to taste.

Step 3: Add BBQ Sauce and Pineapple
Spoon the BBQ sauce evenly over each chicken breast. Top each piece generously with diced pineapple chunks for that juicy burst of sweetness.

Step 4: Add Bacon, Onion, and Cheese
Scatter the cooked, diced bacon over the chicken and pineapple. Add the thinly sliced red onion over everything, then sprinkle mozzarella cheese across the entire dish.

Step 5: Bake the Chicken
Place the baking dish in the preheated oven and bake uncovered for 25-30 minutes. Check that the chicken is fully cooked through and the cheese is melted and bubbling.

Step 6: Broil for Crispiness
Broil the dish for 3-4 minutes to crisp up the cheese beautifully. Keep a close eye to prevent burning, just until the cheese turns golden and slightly crispy.

Step 7: Garnish and Serve
Remove from the oven and top with extra diced pineapple and fresh green onions. Serve immediately for the freshest, boldest flavor.