In large bowl, combine cream cheese, mayonnaise, garlic salt and hot sauce; using an electric mixer on medium speed, mix until smooth.
Stir in artichokes and 1-1½ cups cheese. Transfer to a greased 1-quart baking dish. Top with remaining cheese.
Bake in a preheated 375°F oven 15-20 minutes or until heated through and cheese is bubbly.
Garnish with tomatoes and onions. Serve with cocktail bread slices or tortilla chips.