Pea and onion casserole

This Pea and Onion Casserole combines the sweetness of peas and red onions in a creamy, buttery sauce, baked until golden. It's an easy, comforting dish perfect for any occasion.

21 Mar 2026
Cook time 15 min
Prep time 10 min

Ingredients:

4 tbsp butter
4 tbsp whole-grain wheat flour
1.50 cups milk (2% fat)
1.50 cups peas
2 red onions
1 dash salt
1 dash black pepper
Pea and onion casserole

Pea and onion casserole is a simple yet delicious dish, perfect for a comforting meal any time of the year. This recipe combines the sweetness of peas and red onions with a creamy, buttery sauce. With easy-to-find ingredients and straightforward instructions, anyone can whip up this dish in no time.

Instructions:

1. Preheat the Oven:
- Preheat your oven to 350°F (175°C).
2. Prepare the Onions:
- Peel and thinly slice the red onions. Set them aside.
3. Cook the Peas:
- If using fresh or frozen peas, blanch them in boiling water for 2-3 minutes. Drain and set aside.
- Canned peas can be used as is after draining.
4. Make the Roux:
- In a medium saucepan, melt the butter over medium heat.
- Once melted, add the whole-grain wheat flour to the pan.
- Stir continuously to form a roux, cooking for about 2 minutes until it turns a light golden color.
5. Create the Sauce:
- Gradually add the milk to the roux, whisking continuously to avoid lumps.
- Cook the mixture, continuing to stir, until it thickens into a creamy sauce. This should take about 5-7 minutes.
6. Season the Sauce:
- Add a dash of salt and black pepper to the sauce, stirring well to combine.
7. Combine Ingredients:
- In a mixing bowl, combine the peas and sliced red onions.
- Pour the creamy sauce over the peas and onions and mix well until everything is evenly coated.
8. Transfer to Baking Dish:
- Transfer the mixture to a casserole dish, spreading it out evenly.
9. Bake:
- Place the casserole dish in the preheated oven.
- Bake for 25-30 minutes, or until the top is slightly golden and the dish is heated through.
10. Serve:
- Remove from the oven and let the casserole cool for a few minutes before serving.
- Enjoy your delicious Pea and Onion Casserole as a side dish or a light main course!

This pea and onion casserole is a harmonious blend of flavors and textures that will delight your taste buds. The creamy sauce perfectly complements the tender peas and sweet red onions, making it a crowd-pleaser. Whether enjoyed as a side dish or a light main course, this casserole is sure to become a favorite in your household.

Pea and onion casserole FAQ:

What is the baking time for the Pea and Onion Casserole?

Bake the Pea and Onion Casserole in a preheated oven at 350°F (175°C) for 25-30 minutes, or until the top is slightly golden and the dish is heated through.

How can I tell if the casserole is done?

The casserole is done when the top is lightly golden and bubbling around the edges. You can also check the internal temperature; it should reach 165°F (74°C).

Can I use frozen peas instead of fresh peas in this recipe?

Yes, you can use frozen peas in the casserole. Make sure to blanch them briefly in boiling water for 2-3 minutes before adding them to the dish.

How should I store leftover Pea and Onion Casserole?

Store leftover casserole in an airtight container in the refrigerator for up to 3-4 days. To reheat, bake it in the oven until warmed through, or microwave individual portions.

What can I substitute for whole-grain wheat flour?

You can substitute whole-grain wheat flour with all-purpose flour, or for a gluten-free option, use a gluten-free all-purpose flour blend.

Cooking Tips:

- For a richer flavor, consider using whole milk or half-and-half instead of 2% milk.

- Feel free to add your favorite herbs or spices to enhance the flavor profile of the casserole.

- If you prefer a crunchier topping, you can sprinkle some breadcrumbs mixed with a bit of melted butter over the casserole before baking.

- To make the dish more substantial, you can add some cooked chicken, ham, or bacon bits.

Nutrition Facts

8 Servings
Calories 120kcal
Protein 3.74g
Carbohydrates 11g
Fiber 2.09g
Sugar 4.79g
Fat 7g

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