Cut the tofu into bite-sized pieces.
Finely chop the onion and bell pepper.
Season the tofu with salt and pepper.
Heat olive oil in a pan and sauté the onion and bell pepper.
Add the tofu and stir-fry together.
Transfer the sautéed ingredients to an oven-safe dish, then top with tomato sauce and cheese.
Bake in a 200°C oven for 10 minutes.