Warm up with this hearty French Onion Soup With Croutons Au Gratin recipe. Made with butter, mushrooms, onion and flour. Easy step-by-step instructions …
This French Onion Soup With Croutons Au Gratin relies on simple, everyday ingredients such as (30 ml) butter, (250 ml) thinly sliced onion, (15 ml) all-purpose flour and (30 ml) 35% whipping cream. It comes together quickly and makes 4 servings, at about 221 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