Cut the tofu into bite-sized pieces.
Finely chop onion, bell pepper, and other vegetables.
Season the tofu with salt and pepper.
Heat olive oil in a pan and sauté the vegetables.
Add the tofu and stir-fry lightly.
Place the tofu and sautéed vegetables in an oven-safe dish.
Pour tomato sauce over it and top with cheese.
Bake in the oven at 180°C (356°F) for about 15 minutes.