01 -
Cut bagels in half and brown the outer sides under a medium grill till they get a nice golden color.
02 -
Mix your drained tuna, corn, diced red onion, and mayo together in a big bowl until everything's combined.
03 -
Spread the tuna mix equally on all bagel halves, then sprinkle plenty of shredded mozzarella on each one.
04 -
Return them to the grill until the cheese bubbles and turns a lovely golden color.