Place the portobello mushroom caps on a lined baking sheet. Drizzle olive oil over top and sprinkle with kosher salt and pepper. Place in a 400 degree oven for 10 minutes.

As the mushrooms cook set a skillet over medium heat and add some olive oil. Once the oil is hot add the peppers, onions, kosher salt, and pepper. Cook 4 to 5 minutes.

Add the garlic, beef, and Worcestershire sauce and cook three to four more minutes, breaking the shaved beef apart with a spatula.

Remove from heat and stir in the queso or cheese sauce. Taste for seasoning and add more kosher salt and pepper if needed. Pat the mushrooms dry once they come out of the oven to remove any excess liquid. Stuff the steak mixture into the Portobello mushrooms.

Top each mushroom with the cheese slices and place back into the 400 degree oven for 8 to 10 more minutes.