Slice top off of bell pepper, remove seeds, then slice into rings. Shred zucchini; peel carrots and cut into sticks. Set all aside separately.

Spray a medium-sized skillet with cooking spray, then heat over medium high heat.

Lay 4 slices of bread out onto a plate. Add a few spoonfuls of marinara sauce to each slice, then top with pepperoni, pepper rings, shredded zucchini, and cheese. Top with remaining bread, forming sandwiches.

Add sandwiches to hot skillet and spray the tops with a small amount of cooking spray (or brush with olive oil if you prefer).

Cook 1-2 minutes per side until golden brown and cheese is melted.

Cut each sandwich into quarters; serve with carrot sticks and grapes on the side.