Step 1: Prep All Ingredients - Chop everything into small, even pieces.
Step 2: Make the Dressing - In a bowl, mix mayonnaise, red wine vinegar, olive oil, oregano, garlic powder, salt, and pepper until smooth.
Step 3: Combine the Filling - Add chopped lettuce, meats, cheese, tomatoes, onions, olives, and banana peppers to a large bowl. Pour dressing over and toss well.
Step 4: Prepare the Bread - Slice bread lengthwise and lightly hollow out if too thick. Optionally toast lightly.
Step 5: Assemble the Sandwich - Pile the chopped salad mixture into the bread, press gently, and let sit for a couple of minutes.
Step 6: Slice and Serve - Cut into portions with a sharp knife and serve immediately or wrap tightly for later.