These baked mini veggie and cheese sandwiches are a delicious and healthy snack or appetizer. Packed with colorful vegetables and gooey cheese, they are sure to be a hit with both kids and adults. The sandwiches are made with whole wheat bread, which adds a nutty flavor and extra fiber. Baking them in the oven gives them a crispy exterior while keeping the inside soft and cheesy. Serve them warm with a side of marinara sauce for dipping.