Start by dicing the onion and measuring out your ingredients.

Place a large skillet over medium-high heat and add the olive oil.

Add the diced onions to the skillet and sauté until they are translucent, about 3-5 minutes.

Next, add the ground beef to the skillet, breaking it apart with a spatula. Cook until browned, about 5-7 minutes, ensuring it is fully cooked through.

Sprinkle salt and pepper over the beef while cooking.

Once the beef is cooked, sprinkle the shredded cheddar cheese over the mixture and cover the skillet for a couple of minutes until the cheese melts.

While the cheese is melting, slice the hoagie rolls lengthwise.

Scoop the cheesy beef mixture into the hoagie rolls and add any optional toppings you like.