Crispy Portobello Cheeseburger

Ingredients

• 4 med. portobello mushrooms (about 4 oz. each)
• 4 oz. sharp Cheddar or Gruyère cheese, coarsely grated (about 1 1/4 c.)
• 2 tsp. fresh thyme leaves
• 1 c. panko
• 1/4 c. grated Parmesan
• 2 tbsp. olive oil
• 1 lg. egg
• kosher salt
• Black pepper
• 1 lb. green beans, trimmed
• 4 buns, split and toasted
• Mustard, for serving
• Green-leaf lettuce, for serving
• Sliced pickles, for serving
• Sliced tomatoes, for serving

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