Roasted Green Beans and Mushrooms

Simple side dish

The simple technique of roasting makes vegetables with deep flavor and super yummy. Serve them as a weeknight side dish, in a salad, tossed with pasta, or as a snack, as well as a holiday side dish!

In fact, this green bean recipe reminds me of that green bean casserole that everyone loves at Thanksgiving and Christmas. This is just a lighter, healthier, gluten-free, and really easy deconstructed green bean casserole version. Simplified. Classic. And, super easy to make! 

You could also drizzle these green beans with some Garlic Parmesan Sauce for a fantastic and easy side dish!

Need another Thanksgiving side dish idea to complete your holiday meal? Make my Vegetarian Stuffing.

Looking for more great dishes with mushrooms? Be sure to check out my Baked Barley with Mushrooms, Miso Tahini Pasta with Mushrooms, Mushroom Stroganoff, and Pasta in Cashew Cream.

Tips for choosing and storing green beans

When buying green beans at the store or the farmer’s market, look for brightly colored beans with smooth skin and no brown spots. The beans should easily snap when bent.

Look for medium sized beans. When beans too large or thick, they can get tough and stringy. Older beans can have thick tough skins as well.

After you bring your green beans home, store them, unwashed, in a plastic bag or reusable container in the refrigerator crisper. They should last about a week.

How to cook fresh green beans

With just few simple ingredients this festive side dish comes together quickly. Pop it in the oven, you don’t need to fuss over them, and in about 20 minutes, they’re done.

Be sure to scroll down to the printable recipe card for full ingredient amounts and instructions.

Just chop a few veggies, or buy them pre-chopped from the produce section of your grocery store.

And, you know, a little more or a little less of any of these vegetables isn’t going to make a huge difference. This recipe is also easily doubled. Just use the conversion right in the recipe card to do the calculations for you.

Just be careful not to crowd the pan too much or the veggies will steam, and won’t get as browned.

Toss the chopped green beans, onions, and mushrooms with a bit of oil, salt, and pepper.

Pop them in a cast iron skillet or on a rimmed baking sheet lined with parchment paper or aluminum foil. Hello, easy clean up!

Into the oven they go. After you pull them out check and see if you want a little more salt. I always like to add a little extra salt to my green beans!

How long should you cook green beans?

These oven roasted ones will take about 20 to 25 minutes. That’s it. You don’t even need to stir them while they roast.

I’ve been asked if you need to par boil them first. Nope, no par boiling needed. Making these super simple to make.

In fact, you can clean and chop the veggies a day or two before you need them, place them in a zip top bag, and simply pour them out into the cast iron skillet or sheet pan and roast them up the day you want them.

Can you overcook green beans?

Yes, green beans, especially when boiled or steamed can become gray, squeaky, and lifeless if you over cook them.

Roasting them in the oven helps them keep a great crispy texture and that pretty bright green color while adding a little browned roasty-ness to them.

These cast-iron green beans are a great way to get perfectly cooked veggies!

How do you cook green beans so they are not tough?

Roasting beans with my recipe will get you tender crispy green beans that you’ll be proud to serve to anyone.

How do you know when green beans are done?

They will develop little bits of browning on the edges but will stay tender inside. If you bite into one it should just crunchy on the outside and nice and chewable inside.

Can I prep these ahead?

These green beans are best when cooked fresh.

They are great for prepping ahead though, because you can clean and cut all of the veggies, green bean, mushrooms, and onions ahead of time.

Just pop the cut veggies into a ziptop bag and into the fridge. Then, when you want to roast them, it’s just into the pan & the oven they go!

How to serve

For me, this recipe is one serving, and like I said, I eat it as a snack while I’m cooking other things. It actually helps keep me from snacking on less healthy things while I cook.

If you make this as a side dish, I think it will serve two people.

Also, these would be great tossed with some pasta and maybe a simple mac and cheese sauce or an easy white sauce.

What can I add to green beans for flavor?

I love the flavor of green beans just as they are.

But, if you want them to pop even more, sprinkle in some garlic powder, onion powder, or thyme before roasting.

Shallots can be used in place of the red onion.

Add some lemon or orange zest on top after they come out of the oven to make them fancy.

Green beans

This dish of green beans mushrooms onions is one of my favorites. Besides these oven roasted ones, I love these Air Fryer Roasted Green Beans, Green Bean Casserole, Canning Green Beans, and Niçoise Salad.

Be sure to check out more great side dishes like Roasted Sweet Potatoes, Caramelized Broccoli, Roasted Beets, and Creamed Corn.