Heat oven to 350 degrees F. Mix all ingredients. Spoon into 9 inch pie plate or shallow ovenproof dish. Bake 20 to 25 minutes or until lightly borwned. Sprinkle with sliced green onions and chopped tomatoes, if desired. Serve with tortilla chips, crackers or assorted cocktail bread slices. Makes 2 cups. VARIATION: Spinach Artichoke Dip: Stir 1 package (10 oz) chopped spinach, thawed, well drained into artichoke mixture. Bake as desired.