Freezing Shepard's Pie Made With Previously Frozen Potatoes?

For mashed potatoes that can freeze use one egg for every six medium size potatoes. Make the mashed potatoes the way you like. When you are ready to freeze add the egg/s. Can freeze for one month. The day before you want to serve remove the frozen potatoes and defrost in the refrigerator. Bake until warmed through.

I have never made Shepard's Pie. I assume you could re-freeze, but I would think there would be a loss of flavor and texture. I would portion out the potato in the shape of the pan you intend to use and have it ready to defrost in the casserole when you intend to make it.

Try a small amount sometime and see what the flavor is. I don't care for frozen mashed potatoes one time let alone two, but that means nothing.