Preheat oven to 350°. In top of a double boiler or a metal bowl over simmering water, whisk the first five ingredients until blended; stir in cranberries. Cook and stir 15-20 minutes until mixture is thickened. Remove from heat; stir in vanilla.
Meanwhile, in a large bowl, cream butter and sugar until light and fluffy. Beat in vanilla. In another bowl, whisk flour, oats, salt and baking soda; gradually beat into creamed mixture. Stir in coconut. Reserve half of the dough for topping. Press remaining onto bottom of a greased 13x9-in. baking dish. Bake 8-10 minutes or until set.
Spread sour cream mixture over crust; crumble reserved dough over top. Bake 25-30 minutes or until filling is set and top is golden brown. Cool in pan on a wire rack. Cut into bars.
Notes
Sour Cream and Cranberry Bars
I turned sour cream raisin pie into a cookie bar with a crunchy oatmeal crust, custard-style filling and crisp topping. —Shelly Bevington, Hermiston, Oregon