Preheat your oven to 400°F.
Slice the red bell pepper, zucchini, and red onion into even pieces. Toss them with olive oil, salt, and pepper on a baking sheet.
Roast the vegetables in the oven for about 20 minutes or until tender and slightly caramelized.
While the veggies roast, drain and press the tofu, then cut it into slices. Season lightly with salt and pepper and lightly roast in a non-stick pan (or add to the baking sheet) for about 10 minutes until edges are crisp.
In a small bowl, mix the chickpeas with a pinch of salt and pepper.
Lightly toast the whole grain bread slices.
Spread hummus evenly on one side of each bread slice. Layer the roasted vegetables, tofu, chickpeas, and then sprinkle low-fat mozzarella cheese on one slice.
Close the sandwich with the other slice of bread, hummus side down. If preferred, grill the assembled panini in a panini press or on a skillet, pressing down gently, until the cheese melts slightly and the bread is golden.
Cut the panini in half and serve warm.