My mom's recipe. I love this one!
Why does encasing thin poultry around cured ham and Swiss cheese create such distinct moisture retention? Pounding the breast to an even 1/8-inch thickness ensures the meat cooks uniformly before the dairy inside completely liquefies and escapes. Enrobing the rolls in a mixture of condensed mushroom soup and sour cream establishes a protective braising environment. That dairy-and-fungi emulsion buffers the protein from direct dry heat while adding glutamates that amplify the savory qualities of both the pork and the fowl.
Refrigerating the assembled dish before baking allows the proteins to firm up around the filling, maintaining the cylindrical shape under heat. Serving the final creation over plain rice provides a neutral starch base to absorb the rich sour cream reduction.