Add pepperoncini, mayonnaise, pimientos, onion powder, Dijon mustard, salt, black pepper, cayenne pepper, pickle juice and pickles. Stir with a rubber spatula or wooden spoon to combine all ingredients. Place in serving bowl and serve with crackers. My favorite crackers to serve with my pimiento cheese: Stacy’s Romano with Garlic and Pepper (find them in the deli section of most grocery stores).