Recipe kind of hinges on how big a batch you want to make. For say a 13 x 9, you will need 3 of the vanilla 5.1 oz. pudding packs, 7 1/2 cups of milk (it will say 3, use 2 1/2 for each box). I like a 2 layer, you will need 7 banana's cut into about 15 slices each (again, you can have the chunks as big as you like). 2 box of wafers.
Layer of wafers, layer of banana, layer of pudding. Repeat. (I guess you could make it as many layers as you want) Finish with whole or crushed wafers, I ran out, had about 12 left, so I had to go crushed. Some will put final layer of Cool-Whip, then wafers, not for me.