Warm up with this hearty Buttery Onion Soup recipe. Made with onions, flour, milk and salt. Easy step-by-step instructions included.
This Buttery Onion Soup relies on simple, everyday ingredients such as thinly sliced onions, flour, milk and salt and pepper to taste. It comes together quickly and makes 4 servings, at about 694 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.
It works as a light main on its own or as a starter alongside crusty bread, and it's just as good for a cozy night in as it is for feeding a crowd. Leftovers keep well, so it's a smart choice for meal prep too.
Updated Jun 30, 2026