Roasted Green Beans & Mushrooms (Frozen Green Beans Recipe)

Roasted Green Beans & Mushrooms is an easy and delicious frozen green beans recipe you can make with 7 ingredients in about 30 minutes.

This tasty side dish comes together with balsamic-caramelized frozen green beans, roasted mushrooms, toasted almonds, and a sprinkle of feta. 

Jump to:

• How to Make Frozen Green Beans Crispy
• Why you’re going to love this recipe
• Ingredients
• How to Cook Frozen Green Beans and Mushrooms in the Oven: Step by Step
• Recipe Variations
• Expert Tips
• Recipe FAQs
• Recipe Essentials
• More Easy Side Dish Recipes
• Let's Stay in Touch
• Roasted Frozen Green Beans with Mushrooms & Almonds

Roasted frozen green beans is one of my go-to side dishes.

It's quick and easy and I love the convenience of using frozen instead of fresh green beans. Sometimes you just don't have the time or energy to trim and cut fresh beans.

If you worry at all that cooked frozen green beans will end up sad and soggy -- never fear!

These roasted frozen green beans are a crispy, tender, and flavorful veggie side dish that even picky eaters will gobble up.

How to Make Frozen Green Beans Crispy

Here's the thing: if you roast frozen beans just until they're warm, they're going to be watery and soggy. The secret is to keep on roasting them beyond the soggy stage until they are tender and crispy.

In this roasted frozen green beans recipe, everything gets coated in olive oil and balsamic vinegar then tossed in a hot oven where the green beans slightly blister, the mushrooms become savory and meaty, and the almonds toast perfectly -- and add the best texture. A little bit of creamy feta on top finishes the dish deliciously.

This simple side dish requires minimal prep work and is an easy way to deliver a delicious side dish to your dinner table that everyone will love.

Try these easy side dish recipes next

• Maple Balsamic Glazed Carrots
• Roasted Broccolini Salad
• Zesty Quinoa Salad
• Roasted Potatoes and Green Beans

Why you’re going to love this recipe

Delicious side dish with simple ingredients

Green bean dish that's easy enough for weeknight dinners, special enough for a holiday meal

Roasted frozen green beans that are perfectly tender, not soggy

Ingredients

This simple recipe comes together with really basic ingredients.

Frozen green beans. This recipe uses one 10-ounce bag of frozen green beans, which is about 3 cups. If you’re grabbing from a giant Costco sized bag, use enough to fill a half sheet pan without crowding the pan (see my photo for reference). 

Cremini mushrooms. Cremini mushrooms are also called baby bella mushrooms. They’re earthy and meaty and hold up well to roasting. You can also use white button mushrooms. 

Balsamic vinegar. You’re going to taste the balsamic vinegar in these roasted green beans — which I LOVE, because it adds deep, rich flavor. But if it seems like too much to you, use one tablespoon. 

Garlic. Fresh garlic adds a bright flavor that garlic powder just can’t. If you’d like to use garlic powder, add ½ teaspoon garlic powder about halfway through roasting so it doesn’t burn. 

Sliced almonds. Sliced almonds add nutty flavor and satisfying crunch to these roasted green beans. You can also use almond slivers.

Feta cheese. Feta cheese is tangy and creamy — a nice counterbalance to the rich and earthy flavors. Goat cheese is also delicious here.

How to Cook Frozen Green Beans and Mushrooms in the Oven: Step by Step

Step 1

Preheat the oven to 450 degrees. Prepare a half baking sheet with nonstick cooking spray. 

Step 2

Place the green beans and mushrooms on the baking sheet. Add the olive oil and balsamic vinegar, and salt and black pepper, to taste. 

Toss the green beans and mushrooms around on the pan until everything is coated in the balsamic vinegar and olive oil.

Arrange the frozen green beans and mushrooms in a single layer on the pan, which will allow them to get slightly crispy as they roast. If the pan is too crowded, the beans will steam and won't get crispy.

Step 3

Roast for 20 minutes. Stir halfway through, rearranging the beans and mushrooms in a single layer after stirring. 

Roast them until they are starting to brown in places, slightly crispy, and there’s a wet coating of olive oil and balsamic vinegar on the beans. The beans shouldn’t be soggy, dry, or hard.

NOTE: If your beans are larger, they may take a bit longer to cook.

Step 4

Add the garlic and sliced almonds and toss everything together, no need to arrange everything in a single layer.

Roast for another 3-5 minutes or until the garlic and almonds are golden, toasted, and fragrant. Not burned.

For best results, keep a close eye on them during this process because the garlic and almonds can both burn quickly. 4 minutes is perfect in my oven, but yours may be different. 

Remove the roasted green beans and mushrooms from the pan and sprinkle them with feta cheese. 

Store leftovers in an airtight container in the refrigerator for 3-4 days. 

Recipe Variations

Next time, create your own green bean recipes! Try one or more of these delicious add-ins, swap-outs, and seasonings for frozen green beans. 

Parmesan cheese. Parmesan cheese is a great option to use instead of feta cheese. Toss the finished green beans in 2 tablespoons of fresh grated Parmesan, then sprinkle another 1-2 tablespoons on top. 

Bacon. Toss cooked green beans with crispy bacon bits.

Nuts. Try swapping almonds for walnuts or pecans.

Spices and herbs. Add ½ teaspoon of Italian seasoning, onion powder, or something spicy like a dash of cayenne pepper or a sprinkle of red pepper flakes with the balsamic vinegar and olive oil.

Lemon juice. Toss cooked green beans with a splash of lemon juice.

Expert Tips

Arrange the frozen green beans and mushrooms in a single layer on the baking sheet so the vegetables can get a bit crispy. If they’re piled on top of each other, they will steam and become soggy. 

Adding fresh garlic and sliced almonds at the very end is the best way to keep them from burning.

Keep a close eye after you add the garlic and almonds to keep them from burning. 4 minutes is perfect in my oven, but yours might be different. 

You may need to adjust the cooking time if you are using very thick or very thin green beans.

Recipe FAQs

Recipe Essentials

My Nordic Ware baking sheets have been through the wringer and are still going strong! I think the patina only adds to their charm :). 

This knife sharpener does a great job of keeping a sharp edge on all our knives. It can even sharpen serrated knives!

More Easy Side Dish Recipes

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