Warm up with this hearty French Onion Soup With Croutons Au Gratin recipe. Made with butter, mushroom, onion and fresh thyme. Easy step-by-step instruct…
This French Onion Soup With Croutons Au Gratin relies on simple, everyday ingredients such as butter, thinly sliced onion, all-purpose flour and 35% cream. It comes together quickly and makes 4 servings, at about 223 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