Grilled Portabellas with Caramelized Onions and Avocados


Big, meaty portabella mushrooms team nicely with cool and creamy avocado slices and rings of slow-cooked red onions. Cook the mushrooms on a grill, or broil them. You get lots of great flavor, but a lot fewer calories, than a regular burger.

Prep Time:
15 mins
Cook Time:
15 mins
Total Time:
30 mins
4 servings


  • 4 large portabella mushrooms, stems removed

  • 1 medium red onion, peeled and sliced thin

  • 1 tablespoon olive oil

  • ½ teaspoon salt and pepper

  • 1 Chilean Hass avocado

  • 4 large hamburger buns


  1. Broil or grill mushrooms on both sides until just tender, about 5 minutes per side. Sprinkle with salt and pepper.

  2. Cook onions in olive oil over medium heat until very tender, stirring occasionally, about 10 to 12 minutes.

  3. Cut avocado in half, remove the pit, and peel and cut into slices.

  4. Toast buns. Top bun bottom with grilled portabella, 1/4 of the onion and avocado slices. Top with bun top.

Nutrition Facts (per serving)

241 Calories
13g Fat
28g Carbs
5g Protein
Nutrition Facts
Servings Per Recipe 4
Calories 241
% Daily Value *
Total Fat 13g 16%
Saturated Fat 2g 10%
Sodium 501mg 22%
Total Carbohydrate 28g 10%
Dietary Fiber 5g 17%
Total Sugars 4g
Protein 5g
Vitamin C 7mg 36%
Calcium 72mg 6%
Iron 2mg 10%
Potassium 324mg 7%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.