Slice the tofu sheets thinly.
Shred the chicken breast into small pieces.
Thinly slice the onion, zucchini, and bell pepper.
Heat olive oil in a pan and sauté the onion, zucchini, and bell pepper.
Once the vegetables are cooked, add the chicken breast and season with salt and pepper.
Layer tofu sheets, vegetables, and chicken breast in a lasagna dish.
Pour tomato sauce over the layers.
Bake in a preheated oven at 180°C (356°F) for 10-15 minutes.