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Marinated Portobello Burgers

Portobello caps are the perfect vegetarian burger! No need to create complicated patties when you can just grill these up with a tasty marinade.
Prep Time10 mins
Cook Time15 mins
Marinate8 hrs
Total Time8 hrs 25 mins
Course: Main Course
Cuisine: American
Keyword: grilled portobello caps, marinated portobello burgers, mushroom recipes, portobello burger recipe, veggie burgers
Servings: 4 burgers


  • 4 portobello caps
  • 1 medium onion sliced
  • ½ red or orange bell pepper sliced
  • 1 jalapeño  pepper remove seeds for less heat if needed


  • 2 tablespoon olive oil
  • 4 tablespoon balsamic vinegar
  • 1 large garlic clove grated
  • ½ teaspoon salt
  • ½ teaspoon pepper
  • 1 tablespoon fresh thyme or a couple of teaspoon dry thyme.
  • Blue cheese optional


  • In a medium mixing bowl, put portobello caps, sliced onions, sliced bell pepper, and jalapeño.
  • In a small bowl or measuring cup, mix together oil, vinegar, grated garlic, salt, pepper, and thyme.
  • Pour the marinade over mushrooms, onions, and peppers.
  • Let set in the fridge for a couple of hours or overnight.
  • Heat an iron skillet Buy an Iron skillet here with a tablespoon of olive oil or refined coconut oil.
  • Pull out the onions, and peppers and fry them on medium-low heat until caramelized.
  • While they are cooking, heat your grill and grill the mushrooms until done, flipping and adding leftover marinade as needed.
  • Build burger with portobello, onions and peppers, and blue cheese.