In a medium saucepan, MELT butter; STIR in sugar; ADD crushed crackers; TOSS to mix well.
In a 9-inch pie pan, PRESS mixture firmly onto bottom and sides to form an even crust.
BAKE in a 375° oven for 4 minutes; let COOL on a wire rack.
CRUST (if using store-bought, skip to step )
In a large mixing bowl, COMBINE pineapple, instant pudding (dry) and sour cream; MIX well.
POUR mixture into cooled pie crust; CHILL in refrigerator until ready to serve.
Top slices of pie with Cool Whip if desired.
If scratch crust is not your thing, substitute a store-bought 9-inch graham cracker crust.
Per Serving (excluding unknown items): 591 Calories; 15g Fat (21.8% calories from fat); 5g Protein; 118g Carbohydrate; 4g Dietary Fiber; 37mg Cholesterol; 272mg Sodium. Exchanges: 6 1/2 Fruit; 0 Non-Fat Milk; 3 Fat; 1 Other Carbohydrates.