Preheat your oven to 390°F (200°C).

In a bowl, whisk together olive oil, red wine vinegar, mustard, oregano, salt, and pepper. Marinate the chicken breast in this mixture.

Place bacon in a cold sauté pan. Turn the heat to medium and cook until the bacon is crispy to your liking. Transfer the bacon to a paper towel to drain.

Pour the rendered bacon fat into another sauté pan over medium heat. Add the marinated chicken breast and cook for 2-3 minutes on each side, or until the internal temperature reaches 165°F (74°C). Once cooked, remove from the pan and set aside.

Hollow out the top slice of the baguette, leaving the crust intact. This creates more space for the filling. Spread crispy chili and fried onion butter on the bottom slice of the baguette.

Toast the prepared baguettes in the oven at 390°F (200°C) for 5-6 minutes.

On a large chopping board, combine the onion, tomato, lettuce, cooked chicken, cheese, and bacon. Chop everything together until well mixed. Stir in the honey mustard and mayo until everything is evenly coated.

Fill the toasted baguette with the chicken mixture. Slice the sandwich in half and serve. Enjoy your delicious viral chopped Italian sandwich!