My father-in-law requests this every time he visits. That subtle tangy kick makes these buttery noodles absolutely addictive.

For a stronger tang: If your crowd loves mustard, you can increase the prepared yellow mustard to 4 tablespoons. Start with the base amount, then stir in an extra spoonful at the end after tasting so you For extra richness: Stir in an additional 1–2 tablespoons of butter right before serving for an even glossier, more buttery sauce.

Lighten it up slightly: You can swap half of the heavy cream for whole milk or evaporated milk. The sauce will be a bit thinner and less rich but still comforting; keep an eye on the noodles and stir more often, as a lighter sauce can soak in faster.

Gentle flavor twists: A small pinch of garlic powder or onion powder (about 1/4 teaspoon) can be whisked into the cream and mustard if you want a quiet background flavor without changing the simple character of the dish. A sprinkle of chopped fresh parsley on top at serving adds a bit of color without competing with the mustard cream.

Make-ahead notes: These noodles are best eaten shortly after cooking because egg noodles continue to soak up sauce. If you need to hold them, keep the slow cooker on WARM and stir in a splash of hot water or cream if they tighten up too much.

Leftovers and safety: Cool leftovers quickly and refrigerate within 2 hours in a shallow container. Reheat gently on the stovetop or in the microwave with a spoonful of milk or cream to loosen the sauce, stirring often so the cream doesn’t separate. Because this recipe contains dairy, do not leave it at room temperature for extended periods (over 2 hours).

Noodle choice: Wide egg noodles work best here because they stay tender and hold onto the sauce. Avoid very thin noodles or pasta shapes that may turn mushy with slow cooking. If your slow cooker runs hot, check the noodles earlier than the time given so they don’t overcook.