Combine melted butter and crushed pretzels, then press in the bottom of a 9x13 inch baking pan coated with cooking spray. Bake crust for 10 minutes at 400 degrees F and let cool.
Dissolve gelatin in 2 cups of boiled water and add strawberries, put in refrigerator to thicken.
Mix marshmallows, cream cheese, sugar and 2 cups of Cool Whip until smooth, then spread on cooled crust. Pour thickened gelatin over cream cheese filling and top with remaining Cool Whip. Decorate with fresh strawberries or nuts.