For great crack pie commentary click here.here, but I will say that you basically have to make a buttery oat cookie to begin. Once you have baked the cookie, you let it cool a bit then you crumble it up, add another round of butter and sugar to re-bind it together, and shmush that into a pie tin so that it resembles a crust.
Once it is formed into a crust, set aside. Next you make the filling which consists of more buttery, sugary, creamy goodness. Pour that into the crust and pop in the oven until it browns. To finish off the pie Tosi lets it cool and then refrigerates it overnight (I gave it 6 hours and it was fine). The pie was described in the article as "rich, salty-sweet" but in the comments online I found people saying that they found it too sweet so I added a little extra salt which was definitely a good call for me.