Portobello Mushroom Burger Recipe

4 large portobello mushrooms, stems and gills removed

1/3 c. extra-virgin olive oil

1 tsp. garlic powder

1/2 tsp. ground mustard

1 tbsp. Worcestershire sauce

4 brioche buns

Honey mustard, for serving

Tomato slices, for serving

Lettuce, for serving

Preheat oven to 375°. In a medium bowl, whisk together olive oil, garlic powder, mustard powder and Worcestershire. Dip mushroom caps in the mixture and place mushrooms face-down on a baking sheet. Sprinkle with salt and pepper, to taste. Bake for 20 minutes, until softened.