Name: Healthy Green Bean Mushroom Casserole: Light Recipe
Prep time: 15 min
Cook time: 40 min
Total time: 55 min
Yield: 10
Cuisine: US
Ingredients: Nonstick cooking spray; 1 (8 ounce) package portobello mushrooms; 1 (10.75 ounce) can 98% fat-free condensed cream of mushroom soup; 0.25 cup fat-free half-and-half; 2 (14.5 ounce) cans cut green beans, drained; 0.25 teaspoon ground black pepper, or to taste; 0.125 teaspoon ground white pepper, or to taste; 1 (6 ounce) can crispy fried onions, divided

Green Bean Casserole

Lighter Green Bean and Portobello Mushroom Casserole

Sep 27, 2025
by Addie Kuhic
- 5.0 / 5 ( 1 Ratings)
1 Likes

PREP TIME

15 mins
COOK TIME

40 mins
TOTAL TIME

55 mins
SERVING

10 People
VIEWS

3

Indulge in a guilt-free reimagining of the classic green bean casserole! This lighter version, featuring earthy portobello mushrooms, delivers all the comforting flavors you crave without the extra calories.

Ingridients

Adjust Servings

Nonstick cooking spray

1 (8 ounce) package portobello mushrooms

1 (10.75 ounce) can 98% fat-free condensed cream of mushroom soup

0.25 cup fat-free half-and-half

2 (14.5 ounce) cans cut green beans, drained

0.25 teaspoon ground black pepper, or to taste

0.125 teaspoon ground white pepper, or to taste

1 (6 ounce) can crispy fried onions, divided

Nutrition

Carbohydrate

15 g
Cholesterol

2 mg
Fiber

3 g
Protein

2 g
Saturated Fat

3 g
Sodium

589 mg
Sugar

2 g
Fat

9 g
Unsaturated Fat

0 g

Follow The Directions

01

Step

5 mins

Preheat the oven to 350 degrees F (175 degrees C). Spray an 8x11-inch casserole dish with nonstick cooking spray. (5 minutes)

02

Step

10 mins

Slice half of the portobello mushrooms and arrange them in a single layer at the bottom of the prepared dish. Chop the remaining half of the mushrooms and set aside. (10 minutes)

03

Step

10 mins

In a medium bowl, whisk together the condensed cream of mushroom soup and fat-free half-and-half until smooth. Add the chopped mushrooms, drained green beans, black pepper, and white pepper. Gently fold in 1/2 cup of the crispy fried onions until just combined. (10 minutes)

04

Step

40 mins

Pour the green bean mixture evenly over the sliced mushrooms in the casserole dish. (2 minutes)

05

Step

Bake in the preheated oven for 35 minutes, or until the casserole is heated through and bubbly. (35 minutes)

06

Step

Remove from the oven and sprinkle the remaining crispy fried onions evenly over the top. Return to the oven and bake for an additional 5 minutes, or until the onions are golden brown and crisp. (5 minutes)

07

Step

Remove from the oven and let cool for a few minutes before serving. Enjoy! (5 minutes)

For an even richer flavor, try using a combination of different mushroom varieties, such as cremini or shiitake.
If you prefer a smoother casserole, you can lightly pulse the green bean mixture in a food processor before adding it to the dish.
To add a touch of freshness, sprinkle some chopped fresh parsley or chives over the casserole before serving.

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Addie Kuhic

Written by

Our recipe authors are passionate food lovers who share thousands of diverse dishes from around the world. They bring daily cooking inspiration with delicious, easy-to-make recipes for every occasion.