Cut tofu and shrimp into bite-sized pieces.
Finely chop the onion and bell pepper.
Heat olive oil in a pan and sauté the onion and bell pepper.
Add the shrimp and cook until done.
Add the tofu and lightly stir-fry.
Season with salt and pepper.
Place the ingredients in a gratin dish and top with cheese.
Bake in a 200°C oven for 10 minutes.