Preheat oven to 325°. Line bottom of a 9-in. springform pan with parchment; grease paper.

In a large bowl, beat cream cheese and sugar until smooth. Beat in sour cream, flour and vanilla. Add eggs; beat on low speed just until blended. Pour into prepared pan. Place on a baking sheet

Bake until center is set, 40-50 minutes. Cool on a wire rack 10 minutes. Loosen sides from pan with a knife. Cool 1 hour longer. Refrigerate until ready to assemble, covering when completely cooled.

For cake, increase oven setting to 350°. Line bottoms of two greased 9-in. round baking pans with parchment; grease paper.

In a large bowl, beat sugar, oil, buttermilk, eggs, food coloring, vinegar and vanilla until well blended. In another bowl, whisk flour, cocoa, baking soda and salt; gradually beat into sugar mixture.

Transfer to prepared pans. Bake until a toothpick inserted in center comes out clean, 30-35 minutes. Cool in pans 10 minutes before removing to wire racks; remove parchment. Cool completely.

For frosting, in a large bowl, beat cream cheese, butter and vanilla until smooth. Gradually beat in enough confectioners' sugar to reach desired consistency. Place one cake layer on a serving plate. Spread with 1 cup frosting. Carefully place cheesecake over frosting.