1Prepare the sauce for the lettuce mix by combining vinegar, Italian dressing, pepper, lemon pepper, onion powder, garlic powder, salt, everything bagel seasoning, and mayonnaise.
2Prepare the butter spread for the bread by mixing butter, minced garlic, Italian seasoning, and parsley flakes.
3Brush the butter spread onto the bread.
4Toast the bread in an oven at 350°F for 3 minutes.
5Combine shredded lettuce, purple onion, tomato, pickles, and pepperoncini peppers in a bowl.
6Add the prepared sauce to the lettuce mix and toss to combine.
7Add your choice of meat, such as pepperoni and turkey, to the toasted bread.
8Add mozzarella cheese slices on top of the meat.
9Toast the subs in the oven at 350°F for 4 minutes until the cheese is melted.