– 1 strawberry cake mix – 2 – 21 ounce cans strawberry pie filling – or use homemade recipe – 1 stick butter melted – If using Homemade Pie Filling: – 2 cups strawberries mashed – 1 ½ cups sugar – 6 tablespoons cornstarch – 2 tablespoons lemon juice – ½ teaspoon salt – 6 cups strawberries sliced