I don't actually know what you're referring to, but I use a recipe for banana cream pie that you might be able to adapt: Granny's Banana Cream Pie Recipe | Recipezaar
. Just don't put the sliced bananas into the shell before pouring in the custard, and it seems like you'll be all set. The custard in this recipe comes out mildly vanilla-y and has the perfect amount of sweetness.
Hope I helped! If this is totally unlike whatever you're looking for, I recommend trying it sometime anyway because it's sooo good