Taco-Stuffed Portobello Mushroom Caps

These delicious low-carb stuffed Portobello mushroom caps are really easy to make and deliver a ton of flavor. Taco Tuesday will never be the same!
To prepare the mushroom caps, gently remove stems by hand. Then, scoop out the gills with a spoon and discard. This will give you more room to add your toppings, plus it will remove the residual grit that can sometimes accumulate there. For the taco seasoning, you can use either your favorite prepared blend or make up a batch of this super easy homemade version *recipe is below.

Prep time: 10 minutes
Cook time: 25-30 minutes
Serves: 4-6 servings


  • 3 T. extra virgin olive oil
  • 6 large Portobello mushroom caps, stems and gills removed
  • 1 lb. lean ground beef
  • 2–3 T. taco seasoning* (See homemade recipe below)
  • ½ c. water
  • 10 oz. four cheese Mexican-blend, finely shredded, divided
  • 4 green onions, green part only, finely sliced
  • ½ pint grape tomatoes, washed and cut in quarters
  • 1 avocado, seed and skin removed, cut into small chunks

Sides (optional)

Directions for Stuffed Portobello Mushroom Caps:

  1. Preheat oven to 375° F and line a large, rimmed baking sheet with parchment paper or a Silpat® baking mat.
  2. With a pastry brush, brush olive oil on outside of each mushroom cap, and around the interior and edges. Set finished caps on lined baking sheet and set aside.
  3. Over medium-high heat, brown ground beef in a large skillet until no longer pink inside. Carefully drain off excess fat and return to heat.
  4. Add 2-3 T. taco seasoning mix and ½ cup water to skillet. Stir to distribute taco seasoning evenly. Cook on medium-high heat for 5-7 minutes or until excess water cooks down, stirring occasionally. Remove from heat and cool for a couple of minutes.
  5. Divide the seasoned beef among the 6 mushroom caps. Add approximately 1 oz. of shredded Mexican cheese to each cap and place baking sheet on middle rack of pre-heated oven. Bake for approximately 15 minutes, or until cheese is melted. Remove from heat and cool for a couple of minutes before serving.
  6. To serve, top with chopped tomatoes, avocado, remaining cheese, and green onions. Enjoy!


*Homemade Taco Seasoning Mix 

This recipe only takes a couple minutes to put together and costs less than buying pre-packaged taco seasoning. It also has less salt and no artificial additives or preservatives.


2 T. chili powder

1 T. ground cumin

1 t. ground coriander

2 t. garlic powder

½ t. crushed red pepper flakes

1 t. smoked paprika

1 t. salt

2 t. black pepper

  1. Combine all ingredients in an airtight container and shake well to combine. Use 2 – 3 tablespoons per pound of ground beef (use more or less according to individual taste preferences).

Note: This recipe can also be made in larger batches. Store unused amounts in an air tight container for up to 6 months. Enjoy!



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