1Heat oven to 350°F (325°F for dark or nonstick pan). In ungreased 13x9-inch pan, pour pie filling and strawberries; stir gently to mix.
2In large bowl, beat cake mix and butter with electric mixer on low speed until crumbly, about 1 to 2 minutes. Crumble over fruit mixture. Sprinkle with walnuts.
3Bake 40 to 45 minutes or until bubbly around edges and top is set. Cool at least 30 minutes. Serve warm with ice cream. Store loosely covered.