Place egg whites in a large bowl; let stand at room temperature for 30 minutes. Add the cream of tartar and salt; beat until foamy. Gradually add sugar, 1 tablespoon at a time, beating on high until stiff peaks form (do not under beat). Spread evenly in a greased 13x9-in. baking pan. Bake at 275° for 1 hour; turn off oven (do not open door). Let cool in oven overnight or at least 12 hours.
In another large bowl, beat the cream cheese, sugar and vanilla until smooth; gently fold in whipped cream and marshmallows. Spread over meringue. Chill for 4 hours. Cut into 16 pieces. Combine topping ingredients; spoon 1/4 cup over each serving.
Every editorial product is independently selected, though we may be compensated or receive an affiliate commission if you buy something through our links. Ratings and prices are accurate and items are in stock as of time of publication.