Warm Spinach Dip

1 (8 ounce) package cream cheese, softened
1/2 cup mayonnaise
1/4 cup grated Parmesan cheese
1 (10 ounce) package frozen chopped spinach, thawed and squeezed dry
1 cup shredded mozzarella cheese

In a small mixing bowl, beat the cream cheese, mayonnaise and Parmesan cheese until blended. Stir in spinach and mozzarella cheese. Spoon into an ungreased microwave-safe 9-in. pie plate.
Microwave, uncovered, on high for 4-5 minutes or until bubbly, stirring twice. Serve with crackers or vegetables.