Update 08/04/2019: You can now craft stairs back into blocks!
Placing a stair block into any slot of a crafting table will give you one of its respective blocks.
Slabby allows you to craft all slabs back into their regular blocks with the recipe below.
It's as simple as that.
DM me on Discord if you have issues/concerns/hemorrhoids. - Wyhat#4680
You can give all players the slabby recipes with the command "/function slabby:recipes". This function is run automatically on reload.