Heat olive oil in a large skillet over medium heat.
Add red onion, zucchini, and bell pepper to the pan. Season with sea salt, pepper, and cumin, and cook until veggies are tender, about 7 minutes.
Spread hummus and a slice of cheese on 4 slices of the whole grain bread.
Once veggies are done cooking, evenly place onto the other 4 slices slice of bread. Add a handful of arugula and slices of tomato to each. Place hummus/cheese topped bread on top of veggies topped bread and enjoy!
Notes
*The multigrain bread I used has the following nutrition information per slice: 130 calories, 2 g fat, 28 g carbs, 5 g protein.