1/2 c. butter, chilled
1 (18 1/2 oz.) pkg. yellow cake mix
1 (21 oz.) can cherry pie filling
1/2 c. chopped walnuts

In a mixing bowl, cut butter into cake mix as for pastry dough. Set aside 1 cup. Pat remaining crumbs onto the bottom and 1/2-inch up the sides of a greased 9 x 13 baking pan. Spread pie filling over crust. Combine walnuts with remaining crumb mixture; sprinkle over top.

Bake at 350°F for 30 to 35 minutes. Serve warm with whipped cream or ice cream.