Brown Butter, Walnut and Cheddar Wafers

Ingredients

• 6 tablespoons unsalted butter
• 1 cup grated extra sharp cheddar cheese, about 4 ounces
• 1 tablespoon dry mustard
• 1/4 teaspoon cayenne
• Salt
• 1 cup all-purpose flour
• 1 teaspoon baking powder
• 1 egg, whisked
• 4 tablespoons walnuts, toasted and finely ground