How do you crush Nilla Wafers without making dust?
Stack 5 or 6 wafers in a zip-top bag and gently roll a rolling pin or the bottom of a sturdy cup over them. Stop when you have coarse crumbs with a few larger pieces. Powder-fine crumbs sink into the foam and disappear, so the goal is texture, not dust. A food processor works too, but pulse it in short bursts.

How do you make vanilla cold foam at home?
Whisk ½ cup of cold half and half with 1 pump (about 10 ml) of Vanilla Coffee Syrup until it thickens and holds soft peaks. A handheld milk frother is easiest. So is a Mason jar with a tight lid and 30 seconds of shaking. The vanilla in the foam doubles down on the syrup underneath and ties the whole drink to the pudding reference.

Can I make this without the Nilla Wafers?
Yes, but the wafers are what closes the banana pudding loop visually and texturally. Without them, this drinks more like a banana vanilla cold brew than banana pudding. If you're skipping wafers, consider adding ½ pump more banana syrup to keep the pudding-forward profile.