Cut tofu into bite-sized pieces.
Finely chop onion and bell pepper.
Heat olive oil in a pan and sauté the onion and bell pepper.
Add the tofu to the pan and lightly grill it.
Place the grilled tofu in an oven-safe dish.
Top the tofu with the sautéed vegetables and tomato sauce.
Sprinkle with shredded cheese.
Bake in a preheated oven at 200°C (392°F) for about 10 minutes.