Cream powdered sugar and cream cheese together in electric mixer.
Add whipped cream to mixing bowl and continue to mix until well combined.
Drain crushed pineapple. Fold in pineapples and mini marshmallows. Stir until combined with mixture.
Add food coloring and gently stir to blend. (Optional)
Spoon into pie crust.
Chill for at least two hours.
Remove from refrigerator and sprinkle nut topping on top of pie. Slice and serve immediately.