Onion Casserole Recipe

A decadent and flavorful onion casserole, the perfect side dish to elevate your fish, chicken, or lamb dinner! This recipe features caramelized onions, crispy bacon, and a touch of lemon and red wine vinegar for a sophisticated taste. Garnish with fresh herbs for an elegant presentation.

Prep Time 15 mins
Cook Time 25 mins
Calories 226.7 kcal
Protein 8g
Rating Be the first
Onion Casserole 34

Recipe Actions

Share this recipe:

Recipe Author

Forktionary editorial kitchen team

The Forktionary Kitchen Team

Adapted from Food.com, then tested & standardized by Forktionary.

Ingredients for Onion Casserole

Cook Smarter with Sous, Your Kitchen Companion

Missing an ingredient for this Onion Casserole? Need a perfect wine pairing or a healthy side dish idea? Don't guess—ask Sous! Your AI-powered sous-chef is ready to help you swap ingredients, adjust serving sizes, and discover flavor tips in seconds.

How to Make Onion Casserole

  1. Melt 2 tablespoons of butter in a large skillet over medium-low heat. Add 2 large yellow onions, thinly sliced, and sauté until golden brown and caramelized, about 8-10 minutes, stirring occasionally.
  2. Add 4 ounces of bacon, cooked and crumbled, and 1 teaspoon of fennel seeds. Cook for 2 minutes, stirring to combine.
  3. Stir in 2 tablespoons of lemon juice and 1 tablespoon of red wine vinegar. Bring to a simmer and cook for 2 minutes.
  4. Pour in 1 cup of double cream. Bring to a gentle simmer, then reduce heat and simmer for 4-5 minutes, or until slightly thickened. Season with salt and pepper to taste.
  5. Pour the onion mixture into an oven-safe casserole dish. Sprinkle with fresh herbs (such as chives or parsley) before serving.

Nutrition Information (Approximate per serving)

Sodium

13 g

Sugar

19g

Fat

53g

Carbs

3g

Recipe Categories (Choose a category and find related recipes!)

Frequently Asked Questions

How long does it take to make Onion Casserole?

Onion Casserole takes about 40 minutes from start to finish — roughly 15 minutes to prepare and 25 minutes to cook.

How many calories are in Onion Casserole?

Onion Casserole has approximately 226.7 calories per serving, with about 8 g protein, 3 g carbohydrates and 28 g fat.

What ingredients do I need for Onion Casserole?

The key ingredients for Onion Casserole are Red Onions, Butter, Smoked Bacon, Fennel, Lemon Juice, Red Wine Vinegar. See the full list with measurements above.

Reviews

No reviews yet — be the first to share your thoughts on this recipe!

Write a Review