Preheat oven to 350 degrees.
Heat a large skillet on medium/high heat. Add the ground chuck & onion - sprinkle with taco seasoning. Saute the mixture until the meat & onions are cooked through. Add the minced garlic & cook for another minute. Mix in the corn & black beans; remove from heat. Stir in chopped cilantro to taste.
Fill each hoagie roll with a generous portion of taco filling. Place the hoagies in a 9x13 baking dish. Place 2 slices of Sargento sliced cheddar cheese on top of each filled hoagie roll. Bake for 8-10 minutes. Garnish with more cilantro if desired.