Preheat oven to 325°. In a large bowl, beat cream cheese, ricotta and sugar blend until smooth. Beat in yogurt, butter, cornstarch, flour, lemon juice and vanilla. Add eggs; beat on low speed just until blended. Pour into a greased 9-in. springform pan. Place pan on a baking sheet. , Bake until center is almost set, 80-85 minutes. Cool on a wire rack 10 minutes. Loosen sides from pan with a knife. Cool 1 hour longer. Refrigerate overnight, covering when completely cooled., Remove rim from pan. If desired, serve cheesecake with strawberries.