Heat oven to 350°F. Line bottom and sides of 13x9-inch pan with foil, leaving foil overhanging at 2 opposite sides of pan; spray foil with cooking spray.
In large bowl, beat butter, powdered sugar, granulated sugar and orange peel with electric mixer on low speed until blended. Add vanilla. Beat on medium speed until light and fluffy. Stir in flour, cornstarch and salt. Stir in cranberries. Press dough evenly in pan.
Bake 30 to 32 minutes or until set. Cool completely in pan on cooling rack. Use foil to lift out of pan. Cut into 8 rows by 4 rows.