Chopped Greek Salad With Pita Chips

Name: Chopped Greek Salad With Pita Chips
Ingredients: 2 pitas, split horizontally; 4 tablespoons olive oil; 2 tablespoons red wine vinegar; 1/2 teaspoon dried oregano; kosher salt and black pepper; 1 small head iceberg lettuce, chopped (about 8 cups); 1 pint grape tomatoes, halved; 1 green bell pepper, cut into bite-size pieces; 1/2 English cucumber, sliced; 1/2 red onion, chopped; 1 15.5-ounce can chickpeas, rinsed and coarsely chopped; 4 ounces Feta, crumbled (1 cup); 8 pepperoncini (optional); 1/4 cup pitted kalamata olives (optional)