Warm up with this hearty Portobello Mushroom Onion Soup recipe. Made with onions, thyme, butter and baby portobello mushrooms. Easy step-by-step instruc…
This Portobello Mushroom Onion Soup relies on simple, everyday ingredients such as thinly sliced halved onions, fresh thyme sprigs, butter, divided and brandy, optional. It comes together quickly and makes 4 servings, at about 838 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