Portobello Mushroom Burger

Ingredients

• 4 large portobello mushrooms, stems and gills removed
• 0.333 c. extra-virgin olive oil
• 1 tbsp. Worcestershire sauce (or low-sodium soy sauce)
• 1 tsp. garlic powder
• 0.5 tsp. ground mustard
• 4 brioche buns, for serving

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