This was actually my first pie attempt after mindlessly watching cooking vids. It turned out surprisingly well!
I used a pastry recipe I found online, but to save time I would definitely use the ready made stuff. The only reason I made my own is because I haven't been able to find a ready made pie crust where I live (Guatemala) - I guess because pie isn't a very common dish here.
The filling I just kinda winged based on what was in my fridge and cupboard. Any veggies you have lurking around in the fridge could probably be included here, or you can keep it simple and just use mushrooms.
This is the pastry recipe I used: https://www.inspiredtaste.net/22662/flaky-pie-crust-recipe/