Oven Roasted Green Beans and Mushrooms are so flavorful, healthy, and delicious! It’s a great baked vegetable side dish that cooks up quickly and easily.
Easy Green Beans with Mushrooms and Onions – the combination of mushrooms and onions along with the earthy green beans is the easiest and quickest way to cook green beans! I love to snack on veggies, and this easy vegan combination is one of my favorites!
I first published this recipe in 2018. But it was time for an update. So I’ve updated the photos and the information for a better user experience.
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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!
Need another Thanksgiving side dish idea to complete your holiday meal? Make my Vegetarian Stuffing.
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.
Yes, you can absolutely make this with canned green beans.
Personally, I prefer the flavor and texture of fresh green beans over canned ones. And would recommend fresh.
But I have spoken to some people who prefer canned green beans. And, some people can’t get their hands on fresh green beans year-round, so they prefer the ease of canned.
For those people, I tested this recipe with two 14.5-ounce cans of green beans. I used the same time, temperature, and methods. Drain the green beans well.
And, I think the canned beans were great!
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!
Roasting beans with my recipe will get you tender crispy green beans that you’ll be proud to serve to anyone.
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 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.
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Roasted Green Beans and Mushrooms Recipe
Roasted Green Beans and Mushrooms
Ingredients
- 2 cups green beans ends trimmed off, and cut into 1-2” pieces
- ½ cup sliced red onion
- 2 mushrooms sliced
- 2 teaspoons oil
- pinch of salt
- freshly grated pepper
Instructions
- Preheat oven to 400 ° F.
- Place the prepared veggies in a large cast iron skillet or on a baking sheet, and drizzle with oil, sprinkle with salt and pepper, and toss to coat. Roast in 400° F oven, turning occasionally, for 20-25 minutes, or until a little browned outside and just tender inside.
- Finish with a little extra salt and pepper, if desired (I like my green beans a little salty).
Notes
Nutrition
Nutritional information is based on third-party calculations, and should be considered estimates. Actual nutritional content will vary based on brands used, measuring methods, portion sizes, and more.
Roasted vegetables are such a great side dish. I really the addition of the mushrooms to beef up the green beans. These were delicious and easy to make!
I can tell you are a girl after my own heart. All those roasted veg recipes!!! Roasting veg is just the BEST way to cook it!!
And these green beans are no exception!!! And those red onions, that caramelization that they got!!! I just LOVE roasted onions! This was a delicious recipe! I’ll make it again!
This is such a tasty and quick side! Will definitely put this on heavy rotation.
I’m just one of those people who just can’t get enough of green beans! I love this one asap! It’s absolutely delicious!
Roasted veggies are the best. If someone is not a veggie lover grilling or roasting will concert that person into a veggie lover. Best way to cook greens and mushrooms yummy!
Love oven-roasted green beans. These are so good. Might be my go-to method from now on!
What a delicious side for Thanksgiving!! So happy to have run across it while planning my menus for the holidays!
Can this recipe be made in advance?
Vanessa, these green beans are best when made fresh. I will be making them for Thanksgiving and doing all the prep work of cleaning and cutting them before hand. I’ll pop the cut veggies into a ziptop bag and into the fridge. Then, on Thanksgiving day it’s just into the pan & the oven they go!