Slice tofu into 1cm thick pieces.
Julienne the onion and bell pepper.
Heat olive oil in a pan and sauté the onion and bell pepper.
Add tomato sauce and bring to a boil.
Lay tofu in an oven-safe dish and pour sauce over it.
Top with shredded cheese.
Bake in a preheated oven at 200°C for 10 minutes.