Step 1

Preheat oven to 400 degrees F. Coat a 9- x 13-inch baking dish with cooking spray.

Step 2

In a medium bowl, combine crushed pretzels, butter, and 3 tablespoons sugar. Press mixture into bottom of baking dish. Bake 8 minutes; let cool.

Step 3

In a large bowl, dissolve gelatin in boiling water. Stir in ice water and pineapple, and chill until slightly thickened.

Step 4

In another large bowl, with an electric mixer, beat cream cheese and remaining 1 cup sugar until smooth and creamy. Fold in 3 cups whipped topping and spread evenly over pretzel crust. Spread pineapple mixture over cream cheese layer.

Step 5

Cover and chill at least 4 hours or until firm. Garnish with remaining whipped topping and cut into squares.