1 1/2 sticks melted butter
3/4 c. sugar
1 1/2 c. crushed pretzels

Mix above ingredients and pour in 9x12 glass baking dish. Press down to form a crust.

2ND LAYER:

8 oz. cream cheese
8 oz. Cool Whip
1/2 c. sugar

Combine above ingredients and mix until smooth. Add 1 cup chopped pecans and pour over 1st layer.

3RD LAYER:

20-22 oz. can crushed pineapple (do not drain)
3 tbsp. cornstarch

Mix above ingredients and cook over medium heat until thick. Pour over 2nd layer and refrigerate until cool.