Wash the pumpkin thoroughly, remove the seeds, and slice thinly.
Julienne the onion and bell pepper.
Place the pumpkin, onion, and bell pepper in an oven-safe dish.
Cut chicken breast or tofu into bite-sized pieces and add on top.
Spread tomato sauce and cheese evenly.
Bake in a preheated oven at 180°C (356°F) for 15-20 minutes.