Make the crust: Stir cookie crumbs and melted butter until it sticks together. Press into a pie pan and chill for 20 minutes to set. Prep vibes: solid crust, no wobble.
Banana layer: Arrange sliced bananas evenly on the bottom of the crust. It’s okay if they overlap—this is a friendly pie, not a math test.
Establish the pudding: In a saucepan, whisk milk, cream, sugar, egg yolks, cornstarch, and salt. Cook over medium heat, whisking constantly, until thick and glossy—think pudding meets custard. This takes about 6–8 minutes.
Finish the filling: Remove from heat, stir in vanilla. Pour the warm custard over the banana layer, smoothing the top.
Chill time: Refrigerate the pie for at least 4 hours, or overnight if you’re ahead of life. The longer it rests, the happier the flavors get.
Top and serve: Just before serving, sprinkle crushed Biscoff cookies on top for extra crunch. Slice, plate, and enjoy the hug in a dessert form.