Creamy Mushroom and Green Bean Casserole

🕒 Prep: 20 min
🔥 Cook: 30 min
🍽 Serves: 6
★★★★★
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If you’re looking for a comforting dish that brings together the earthiness of mushrooms and the crispness of green beans, this Creamy Mushroom and Green Bean Casserole is a must-try. It’s perfect for a cozy family dinner or as a standout side dish for your next gathering.

Ingredients for Creamy Mushroom and Green Bean Casserole

The backbone of this recipe is the fresh green beans, which add a crisp texture and vibrant color. Cremini mushrooms offer a deeper, more intense flavor than button mushrooms, making the dish more robust. Onion and garlic provide a savory base, while butter adds richness. All-purpose flour helps thicken the sauce, and whole milk ensures it’s creamy and smooth. Parmesan cheese gives a salty tang that complements the vegetables. Crispy fried shallots on top add a delightful crunch and a hint of sweetness. Finally, a touch of nutmeg rounds out the flavors with a warm, slightly spicy note.

Tips & Tricks

  • Blanch the green beans just until they’re tender-crisp to keep them from getting mushy.
  • If the sauce seems too thick, add a splash more milk to reach your desired consistency.
  • Use freshly grated parmesan for the best flavor and texture.

Serving Suggestions

This casserole pairs wonderfully with roasted chicken or a juicy steak. It also complements a simple green salad with a light vinaigrette. For a vegetarian meal, consider serving it alongside a hearty grain like quinoa or farro.

Frequently Asked Questions

Can I use frozen green beans?
Yes, just make sure to thaw and drain them well before using.
What if I don’t have cremini mushrooms?
Button mushrooms work well as a substitute, though the flavor will be slightly milder.

Creamy Mushroom and Green Bean Casserole Recipe Walkthrough

Preheat your oven to 375°F to get it nice and hot by the time your casserole is ready to bake. Start by blanching the green beans in boiling water for about 3 minutes. This quick bath will keep them bright green and slightly tender. Drain them and set aside for later.

In a large skillet, melt the butter over medium heat, then toss in the onion, garlic, and mushrooms. Sauté everything for about 5 minutes until the mushrooms are soft and the onions are translucent. You’ll want to stir in the flour next, cooking it for about a minute. This step is crucial for thickening the sauce.

Slowly whisk in the milk to create a creamy base. Keep stirring until the sauce thickens. Add in the parmesan cheese, salt, pepper, and nutmeg. Mix everything until it’s well incorporated and smooth.

Now, fold the green beans into the creamy mixture and transfer everything to a greased 9x13 inch baking dish. Sprinkle the crispy fried shallots over the top. Bake the casserole for 25-30 minutes until it’s golden and bubbly. Let it cool slightly before serving to allow the flavors to meld together.

Why You'll Love This Recipe

  • Combines fresh, wholesome ingredients for a rich, savory flavor.
  • Quick and easy enough for weeknight dinners but special enough for holidays.
  • Creamy, cheesy goodness without the canned soup shortcut.
  • Delivers a satisfying crunch with crispy fried shallots.

Ingredients

1 lb fresh green beans, trimmed and halved
2 cups cremini mushrooms, sliced
1 medium onion, diced
2 cloves garlic, minced
3 tbsp unsalted butter
3 tbsp all-purpose flour
2 cups whole milk
1/2 cup grated parmesan cheese
1 cup crispy fried shallots
1 tsp salt
1/2 tsp black pepper
1/4 tsp nutmeg

Step-by-step Instructions

1. Preheat oven to 375°F.
2. Blanch green beans in boiling water for 3 minutes, then drain and set aside.
3. In a large skillet, melt butter over medium heat and sauté onions, garlic, and mushrooms until softened, about 5 minutes.
4. Stir in flour and cook for 1 minute.
5. Gradually whisk in milk, cooking until thickened.
6. Add parmesan cheese, salt, pepper, and nutmeg; mix until well incorporated.
7. Fold in green beans and transfer mixture to a greased 9x13 inch baking dish.
8. Top with crispy shallots and bake for 25-30 minutes or until golden and bubbly.
9. Let cool slightly before serving.

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