Cut the tofu into bite-sized pieces.
Finely chop onion, bell pepper, carrot, and other vegetables.
Heat olive oil in a pan and sauté onion, bell pepper, and carrot.
Add the tofu and lightly stir-fry.
Add tomato sauce and mix evenly.
Transfer to a gratin dish.
Sprinkle mozzarella cheese on top.
Bake in a 200°C oven for 10–15 minutes until the cheese turns golden brown.