Cheese Soufflé with Asparagus

Ingredients (13)

• ½ lb asparagus
• 1 tbsp olive oil
• 1½ tsp Kosher salt
• 1 tsp black pepper
• 3 tbsp Parmesan cheese
• 3 tbsp unsalted butter
• ⅓ cup flour
• 1 cup whole milk
• 1 cup Gruyere cheese
• 1 tsp Dijon mustard
• 3 tbsp chives
• 1 tsp Dijon mustard
• 4 large eggs