Prepare and freeze prior to baking in the oven or it can also be frozen as a completed dish and reheated in individual portions in the microwave.
Try different pasta types, instead of macaroni elbows you can try penne pasta.
Omit the chicken and if wished replace with chopped chorizo sausage
Omit the chicken and bacon if wished and carefully mix through lightly cooked cauliflower or broccoli florets before spooning into the ovenproof dish
Try different cheese variations such as grated tasty cheddar or smoked cheddar instead of Parmesan cheese.