Onions Au Gratin
Onions Au Gratin offers tender, caramelized onions topped with a rich, cheesy sauce. The combination of Swiss and Parmesan cheeses creates a savory, golden crust perfect for cozy dinners or elegant gatherings. This comforting dish pairs well with roasted meats or as a standalone vegetarian delight.
Ingredients
Instructions
- Slice the onions into 1/2-inch thick rings.
- Sauté the onions in butter until tender.
- Place the sautéed onions into a greased 8-inch square baking dish.
- In a bowl, stir the beef broth, whipping cream, flour, and pepper until smooth.
- Pour the mixture over the onions in the baking dish.
- Sprinkle the shredded Swiss cheese and grated Parmesan cheese over the top.
- Bake uncovered at 350°F for approximately 30 minutes or until the cheese is golden brown and the mixture is bubbly.
Tips & Substitutions
For a richer flavor, consider adding a splash of white wine to the broth mixture. If you're short on time, pre-sautéed frozen onions work, but fresh onions will provide better texture. You can also substitute the Swiss cheese with Gruyère for a more robust taste. For a gluten-free option, use cornstarch instead of flour.
Serving Suggestions
This dish makes a fantastic side for roasted meats or a hearty main alongside a green salad. It pairs beautifully with Beef Tenderloin With Roasted Shallots And Port or can be served as a comforting appetizer. For a complete meal, consider serving with a side of garlic bread or a fresh vegetable medley.
Storage & Reheating
Leftover Onions Au Gratin can be stored in an airtight container in the refrigerator for up to 3 days. To reheat, place in a preheated oven at 350°F for about 15-20 minutes until warmed through and the cheese is bubbly again. Avoid microwaving for best texture.
Nutrition & Diet Analysis (per serving)
Each serving of Onions Au Gratin contains roughly 255 calories, with 5g protein, 19g carbohydrates, and 18g fat. It is an excellent source of vitamin C (69% of the Daily Value), and a good source of dietary fiber. It also contributes 3g of dietary fiber toward your daily target.
Estimated from ingredients & per-serving nutrition — verify against package labels for allergies or strict diets.
* % Daily Values based on a 2,000 calorie diet (FDA 2020).
Frequently Asked Questions
Can I use other types of cheese in this recipe?
Yes, you can experiment with other cheeses such as cheddar or fontina. Each will bring a different flavor profile to the dish. Just keep in mind that some cheeses may melt differently, affecting the final texture.
What can I do if the onions are not tender after sautéing?
If the onions are still firm after sautéing, try cooking them a bit longer over medium heat, stirring frequently. You can also add a splash of beef broth to help them soften more quickly. The goal is to achieve a translucent and tender consistency before baking.
Is it possible to make this dish vegetarian?
Absolutely! Simply replace the beef broth with vegetable broth and use plant-based butter or margarine. This makes the dish suitable for vegetarians while still retaining a delicious flavor profile.
Nutrition is estimated from USDA FoodData Central ingredient data and may vary with brand, portion and preparation — see our methodology. This information is for general educational purposes only and is not medical or dietary advice (disclaimer).