Cut the tofu into bite-sized pieces.
Slice the onion and bell pepper into thin strips.
Heat olive oil in a pan and sauté the onion and bell pepper.
Add the tofu to the pan and stir-fry together.
Pour in the tomato sauce and mix everything well.
Transfer to an oven-safe dish and sprinkle low-fat cheese on top.
Bake in a preheated oven at 200°C for 10 minutes.
Finish with a sprinkle of parsley.