Gougères (French Cheese Puffs)

Bahan-bahan (28 porsi)

• 1 cup low-fat milk ((or ½ cup whole milk + ½ cup water))
• 1/2 cup (1 stick) unsalted butter, cut into 4 pieces
• 1 teaspoon salt
• 1 cup all-purpose flour, (spooned into measuring cup and leveled-off)
• 4 large eggs, (at room temperature)
• 1 large egg white, (at room temperature)
• 2 teaspoons Dijon mustard
• 2 cups coarsely grated cheese, (such as Comté, Gruyère and/or sharp cheddar)