Cut the tofu into bite-sized pieces.
Prepare and slice the onion, bell pepper, and broccoli.
Heat olive oil in a pan and sauté the onion, bell pepper, and broccoli.
Add the tofu to the pan and cook until it turns slightly golden.
Place the sautéed vegetables and tofu in a baking dish.
Pour tomato sauce over them and top with cheese.
Bake in a preheated oven at 200°C (392°F) for 10-15 minutes.