Tender chuck beef and mushrooms slow cook in a creamy mushroom sauce, then finish with sour cream and wide egg noodles. It takes only a few minutes to put together, and the uncooked ingredients can be frozen in a bag ahead of time.
Chuck roast or packaged stewing beef gives the most tender result. Sirloin also works but cooks faster, so start checking after about 240 minutes on Low.
Use full-fat sour cream at room temperature, since lower-fat versions can split in hot sauce. Crème fraîche is a good substitute.
Store leftover stroganoff in an airtight container in the refrigerator for 3 to 4 days. Keep the noodles separate if possible, as they soften as they absorb sauce.
Reheat gently in a saucepan over low heat with a splash of broth or milk, or in the microwave in short bursts, stirring between each one, until steaming hot at 165°F.
The cooked beef and sauce, before the sour cream is added, can be frozen for up to 3 months. Thaw overnight in the refrigerator, reheat, and stir in fresh sour cream.
If the sauce looks too thin at the end, leave the lid off for 15 minutes before adding the sour cream. If it looks too thick, stir in a splash of beef broth.
Calories are an estimate and will vary with the cut of beef and the brands used.