Cinnamon Brown Butter Breakfast Puffs

Name: Cinnamon Brown Butter Breakfast Puffs
Ingredients: 2/3 cup granulated sugar; 1 tablespoon ground cinnamon; 6 tablespoons unsalted butter; 1 1/2 cups all-purpose flour; 1 1/2 teaspoons baking powder; 1/2 teaspoon baking soda; 1/2 teaspoon table salt; 1/4 teaspoon freshly grated nutmeg; 1/2 cup granulated sugar; 1/3 cup (5 tablespoons plus 1 teaspoon) unsalted butter, at room temperature, plus extra for greasing muffin cups; 1 large egg; 1 teaspoon pure vanilla extract; 1/2 cup buttermilk