Preheat the oven to 400 degrees. Cook egg noodles according to the package. Strain and set aside.
In a large mixing bowl, combine ground beef, egg, and breadcrumbs. Roll into 1–2-inch balls and place evenly in a baking dish.
Mix the cream of mushroom soup and milk until smooth and creamy. Pour evenly over the meatballs, then bake, covered, for 30 minutes.
In a large skillet, melt the butter over medium-high heat. Add the egg noodles and cook until slightly crispy. Remove from heat and serve with meatballs and sauce.
Notes
Roll the meatballs evenly so they cook at the same rate and stay consistent in texture.
Cover the dish while baking to keep the meatballs tender and prevent the sauce from drying out.
Use wide egg noodles since they hold the sauce beautifully.
Taste and adjust the seasoning once everything is combined, adding extra salt and pepper if needed.