In a large bowl, combine grated cheddar and cream cheese until smooth.
Stir in mayonnaise, Dijon mustard, and garlic powder, mixing until fully incorporated.
Fold in chopped pimentos. Season with salt, black pepper, and optional cayenne or jalapeños if desired.
Adjust texture by grating cheese more coarsely for a chunkier spread.
Cover and refrigerate for at least 1 hour to let flavors meld.
