How not to bake pies
It turns out that eggs have a very important function in pies. We couldn’t tell you since we’re not food scientists, but based on this picture and its description, the pie probably would’ve come out not as oily as this. The silver lining is that the OP could’ve eaten the pies, despite their unattractive appearances.
How do you forget to put eggs into a pie mix? Well, if this was the first time OP tried their hand at baking, then it’s somewhat understandable. Oh, and just so you know, these aren’t actually pies. These are tarts. See? We know a bit about food, too.