Two Cheese Gougeres

Name: Two Cheese Gougeres
Ingredients: ¾ cup plus 1 tablespoon water; ¼ cup whole milk; 4 tablespoons unsalted butter; ½ teaspoon table salt; 60 grams white rice flour; 75 grams gluten-free corn flour*; 1 teaspoon mustard powder; ¾ teaspoon finely minced rosemary; ¼ teaspoon freshly ground black pepper; 3 eggs plus 1 egg white (room temperature); 40 grams strongly flavored bleu cheese, crumbled; 70 grams extra sharp cheddar, grated