Par‑cooking potatoes: Peel and cube to ½–1 inch. Boil 6–7 minutes until slightly softened. Drain and rinse under cold water to stop cooking. Potatoes will finish baking in the pie.
Pan size: A deep‑dish 9‑inch tin fits perfectly and may need an additional 10–20 minutes. A standard 9‑inch tin may yield ~1½ cups extra filling—simmer on the stove and enjoy.
Oven insurance: Bake on a rimmed cookie sheet to catch drips. Cover edges with foil if they brown too fast.
Crust tip: Try a favorite homemade crust for extra flake and flavor—great for sweet or savory pies.