In large bowl, mix cream cheese, mayonnaise, garlic powder, onion, worcestershire sauce, mustard and salt and pepper using a stand mixer or hand mixer. You can also mix by hand, but make sure ingredients are incorporated fully.
Add the cheddar cheese and pimento and mix gently to incorporate. (By waiting to add the cheddar cheese and pimento, you’ll see bigger chunks.)
If you want a smoother texture, you can add the cheese and pimento at the same time as the other ingredients and mix until smooth.