In a stand mixer, cream together the cream cheese and white sugar. Mix until fully combined. Add fully-drained crushed pineapple and mix until combined. Fold in the frozen whipped topping with a spatula.
Pour mixture into the pre-made graham cracker crust.
Refrigerate for 2 hours, at minimum, to let the pie set up before serving. I like to put it in the freezer for a few minutes, too, which really firms it up.
Garnish, optionally, with drained pineapple tidbits and maraschino cherries.
Notes
Be sure to fully drain the crushed pineapple, which can take longer than you would think. If you do not drain it well, the pie will be too thin.
You must refrigerate this pie for a few hours prior to serving, as it is necessary for it to set up. That said, I do like to pop it in the freezer to firm it up to an even greater extent + shorten the time between making the pie and eating it.