Try this homemade Onions Au Gratin recipe the whole family will love. Made with onions, boiling water, chicken and thyme. Easy step-by-step instructions…
This Onions Au Gratin relies on simple, everyday ingredients such as large onions, thinly sliced, boiling water, dried whole thyme and salt and pepper. It comes together quickly and makes 4 servings, at about 607 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.
It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.
Updated Jun 30, 2026