Sheet Pan Pavlova

From Real Simple magazine Preheat oven to 250. Line a large cookie sheet with parchment paper. Beat 8 egg whites with 1/4 t cream of tartar - then add 2 cups sugar. Add 1 t vanilla. Spread on cookie sheet and put in oven for 2 hours. Turn off heat and leave another 2 hours. Stir together: 1 lb fresh berries 2 medium mangoes peeled and chopped 3 T sugar Beat: 2 cups heavy cream 1/2 cup sour cream 1/4 cup XXX sugar Spread whipped cream on merangue and then add fruit.