Strawberry Pretzel Salad Ingredients Topping 2 packages (4-serving size each) Jell-O® strawberry-flavored gelatin 2 cups boiling water 2 boxes (16 oz each) frozen sweetened strawberries, thawed Crust 2 cups pretzels, crushed 3/4 cup butter, melted 3 tablespoons sugar Filling 1 container (8 oz) Cool Whip frozen whipped topping, thawed 1 package (8 oz) cream cheese, softened 1 cup sugar