A melted blend of savory cheeses, a few spices, sliced pimentos, and mild crackers for dipping make this Kentucky Derby appetizer a crowd-pleasing favorite.
Preheat oven to 375 degrees F. Spray a shallow baking dish with cooking spray, then set aside.
Using a stand mixer (or a hand mixer + large bowl), beat mayonnaise, cream cheese, Worcestershire sauce, hot sauce, ground mustard, salt, and pepper on medium-high speed until mostly smooth, about 3-5 minutes.
Remove bowl from mixer and add cheddar cheese, pepper jack cheese, pimentos, and green onion to bowl. Use a spatula to gently fold all the ingredients together until thoroughly mixed.
Pour cheese mixture into prepared baking dish and gently smooth out the top so that it's flat.
Bake dip for 15-20 minutes or until the cheese is melted and bubbly.
Serve dip immediately with crackers or veggies for dipping.