1. Prepare the Crust:

1. In a large mixing bowl, combine cherry pie filling and drained crushed pineapple.
2. Stir in sweetened condensed milk until fully incorporated.
3. Fold in whipped topping gently until mixture is smooth and fluffy.
4. Add mini marshmallows and chopped pecans (if using), then mix lightly.
5. Cover and refrigerate for at least 2 hours before serving.