Preheat oven to 350°. Combine crumbs and shortening; press firmly on bottom of 9” spring form pan. In large bowl, beat cheese until fluffy. Gradually beat in sweetened condensed milk until smooth. Beat in eggs and vanilla. Toss 1/2 cup chips with flour to coat; stir into cheese mixture. Pour into prepared pan. Sprinkle remaining chips over top. Bake 55 minutes or until center is set. Cool. Chill. Refrigerate leftovers.