Mix cream cheese, spinach, artichokes, shredded cheese, mayo, garlic, cayenne, salt and pepper in a medium-sized bowl.
8 ounces cream cheese, softened, 1 cup frozen chopped spinach, thawed and drained, 7 oz can artichokes, drained and chopped, 1 cup shredded parmesan cheese, 1/3 cup mayo, 1/2 teaspoon black pepper, 1/2 teaspoon salt, 1 clove garlic, minced, 1/8 teaspoon cayenne pepper, if desired