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["Preheat oven to 350u00b0F.", "Grease a 13""x9"" baking pan.", "Reserve 2/3 cup cake mix; set aside.", "For the crust: in a large mixing bowl, stir together remaining cake mix, melted butter and 1 egg until thoroughly blended (mixture will be crumbly).", "Press mixture evenly into bottom of prepared pan.", "Bake until light golden brown (15-20 minutes).", "In a large mixing bowl, combine reserved cake mix, maple syrup, remaining 3 eggs, sugar and vanilla extract; beat at low speed of electric mixer for 3 minutes.", "Pour over crust.", "Sprinkle with walnuts.", "Bake until filling is set (30-35 minutes).", "Cool completely in pan.", "Cut into bars to serve, and store any extras in refrigerator."]
