This is a tried and true flaky buttery crust ready for whatever fillings you want to use. Best part is, you can make the dough ahead and let it sit in the fridge. I've had dough in my fridge up to 3 weeks before without issue.
Add diced butter and using hand or a dough cutter, cut butter in until flour has a crumb appearance
Add curdled milk and mix until dough comes together
Form into a ball, wrap into plastic wrap and set in fridge for a minimum of 2 hours up to a couple weeks
When ready to bake, pull it from the fridge, give it 5-10 min to warm up or just massage it around in your hands for a few minutes while it's still in the plastic wrap
Once it's slightly softened, grab you rolling pin, plastic wrapped can or whatever it is you're using to roll it out and roll it to about 1/8" thickness.
Place in your ramekin, poke holes throughout the sides and bottom. Line the dough with foil or parchment and fill with a smaller ramekin, rice, beans, pie weights, whatever you have handy
Bake in a 375 degree oven for 10min, remove the weights and liner, prick the bottom again and bake for an additional 2 min or so until golden. Let cool before filling.