Finely chop the onion and bell pepper.
Heat olive oil in a pan and sauté the onion and bell pepper.
Add the silken tofu and season with salt and pepper.
Pour in the milk and simmer on low heat.
Transfer to an oven-safe dish and generously top with mozzarella cheese.
Bake in the oven at 180°C (356°F) for 10 minutes until the cheese is golden and melted.