Rinse the soft tofu with water and drain well.
Finely chop 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 simmer.
Place the soft tofu in an oven-safe dish, pour the sauce over, and top with cheese.
Bake in the oven at 200°C for 10 minutes to finish.