How to Make It
Preheat oven to 400°.
To prepare crust, combine first 3 ingredients in a medium bowl. Drizzle with butter; toss with a fork until moist. Press mixture into bottom of a 9-inch springform pan coated with cooking spray. Bake at 400° for 7 minutes or until lightly browned. Cool on a wire rack.
Reduce oven temperature to 325°.
To prepare filling, place cheeses in a large bowl; beat with a mixer at medium speed until smooth. Add sour cream; beat until combined. Combine 1 1/3 cups sugar, flour, and salt, stirring with a whisk. Beating at low speed, gradually add sugar mixture to cheese mixture. Add egg whites and egg, 1 at a time, beating well after each addition. Beat in liqueur and vanilla. Pour mixture into prepared pan. Bake at 325° for 1 hour or until cheesecake center barely moves when pan is touched. Remove cheesecake from oven; run a knife around outside edge. Cool to room temperature. Cover and chill at least 8 hours.