Remove the skin from the pumpkin and cut it into small pieces.
Drain the tofu and cut it into cubes.
Cut the chicken breast into bite-sized pieces.
Finely chop the onion and cut the broccoli into bite-sized florets.
Season the chicken breast with salt and pepper.
Heat olive oil in a pan and sauté the onion and chicken breast.
Add the pumpkin and broccoli and cook until tender.
Add the tofu and mix well.
Pour in the milk and mozzarella cheese, then stir again to combine.
Transfer to a gratin dish and sprinkle cheese on top.
Bake in the oven or air fryer at 200°C (392°F) for 10 minutes.