Cheese Puffs

Ingredients (9)

• 1 cup water
• 2 tablespoons butter
• 1/2 teaspoon salt
• 1/8 teaspoon cayenne pepper
• 1 cup all-purpose flour
• 4 large eggs, room temperature
• 1-1/4 cups shredded Gruyere or Swiss cheese
• 1 tablespoon Dijon mustard
• 1/4 cup grated Parmesan cheese