Try this Mini Potato Gratin Stacks recipe, or contribute your own.
Most home cooks slice potatoes too thickly for individual muffin tins, resulting in raw centers even when the edges look done. Russets release starch as they bake, which acts as a natural binder when combined with the beaten egg. Slicing the tubers thinly on a mandoline ensures the heat penetrates rapidly during the initial covered bake at 350 degrees Fahrenheit. Covering the tin traps steam, softening the starch cells before the exterior burns. Foil removal during the final stages lets moisture escape so the gruyere cheese develops a deep, golden crust.
Probes cannot accurately measure individual stacks. Insert a paring knife directly into the center of the tallest potato stack after 35 minutes of covered baking. Zero resistance indicates proper starch gelatinization. Encountering crunch means recovering the pan with foil and baking for another five-minute increment. Let the tins rest for ten minutes post-bake. This cooling window allows the interior starches to set, preventing the stacks from collapsing when extracted with a spoon.