Alternate layers of mashed potatoes, turkey, and stuffing to create distinct textural zones that prevent the casserole from becoming a homogeneous mush while baking.

Pat dry all turkey pieces and vegetables before assembling to prevent excess moisture from making the casserole watery and compromising the crispy top layer.

Mix crushed stuffing with melted butter and scatter on top during the last 10 minutes of baking to achieve a golden, crispy contrast against the creamy interior.

Swirl cranberry sauce throughout the layers rather than concentrating it in one spot to distribute its tartness evenly and prevent overly sweet pockets.

Mix mayo with the mashed potatoes layer (not added directly) to create a creamy, cohesive base that holds ingredients together without adding an oily sheen to the finished dish.