Cut the silken tofu into bite-sized pieces.
Finely chop the onion and bell pepper.
Place the tofu in an oven-safe dish and season with salt and pepper.
Top the tofu with the chopped vegetables and tomato sauce.
Generously add mozzarella cheese on top.
Bake in the oven at 200°C (392°F) for 10-15 minutes until the cheese is golden brown.