In a large mixing bowl, combine the grated cheddar cheese and pepper jack cheese.
Add the cream cheese to the bowl with the grated cheese. Use a spatula or a hand mixer on low speed to mix until the cheeses are well combined.
Add the mayonnaise, diced pimientos, Worcestershire sauce, onion powder, ground black pepper, smoked paprika, and garlic powder into the bowl. Stir the ingredients until well incorporated.
Serve immediately or chill in the refrigerator before serving.
Serve the Pimento Cheese with Ritz crackers.
Notes
I recommend grating block cheese with the large side of a hand grater for the best taste and consistency.