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lasagna stuffed portobello mushroom on gray plate with fork taking a bite
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4.67 from 6 votes

Lasagna Stuffed Portobello Mushrooms (Make Ahead, Freezer)

Lasagna stuffed portobello mushrooms has everyone's favorite lasagna ingredients (marinara, ricotta, spinach and basil) but served up in a deliciously roasted portobello mushroom! Low carb, freezer-friendly and vegetarian.
Prep Time15 mins
Cook Time20 mins
Total Time35 mins
Course: Main Course
Cuisine: Italian
Diet: Diabetic, Gluten Free, Vegetarian
Servings: 4
Calories: 261kcal


  • 4 portobello mushrooms see note 1
  • 1-2 tablespoons olive oil
  • 1 cup marinara sauce
  • 1 1/2 cups ricotta
  • 1/4 teaspoon salt
  • 1 egg
  • 1 1/2 cup fresh spinach chopped
  • 1/2 cup chopped chopped
  • 1 cup mozzarella shredded


  • Prep mushrooms- Start by snapping off the stems, and use a spoon to scoop the gills out of four portobello mushrooms. Wash, then pat gently dry. Brush mushrooms on all sides with olive oil, and arrange on a sheet pan.
  • Fill mushrooms- Spoon 1/4 cup of marinara sauce into each mushroom. Mix together ricotta, spinach, basil and egg, then divide it evenly between four mushrooms. Sprinkle tops with shredded mozzarella cheese.
  • Bake- Place in a 400°F oven, and bake for 20 minutes, or until mushrooms are dark brown and tender. You do not want the mushrooms to get completely soft, as they will collapse and all the lasagna fillings will spill out.

Freezing for later

  • Prepare and bake portobello mushrooms as indicated above. Cool completely, then wrap each mushroom in foil. Place foil-wrapped mushrooms in a meal prep container, reusable silicone bag or plastic freezer bag.Freeze for up to 3 months.

To bake from frozen

  • Heat oven to 350°F. Unwrap the mushrooms, and flatten out foil. Arrange frozen mushrooms in a 9 x 9 inch baking dish, then cover the dish with the foil (or use a reusable silicone lid).
  • Bake for 40- 50 minutes, or until cheese is bubbly and mushrooms are heated through. You may want to remove the lid for the last 10 minutes to help liquid evaporate.



1- choose portobello mushrooms with large, intact caps that round up. Avoid flat caps if possible.


Serving: 1portobello mushroom | Calories: 261kcal | Carbohydrates: 11g | Protein: 21g | Fat: 16g | Saturated Fat: 7g | Cholesterol: 89mg | Sodium: 457mg | Fiber: 2g | Sugar: 5g