Hazelnut Muffins

Name: Hazelnut Muffins
Ingredients: 4 ounces unsalted butter 4 ounces unsalted butter; 1/2 cup raw hazelnuts, skins on, chopped into rough halves; 1/2 teaspoon kosher salt; 1/2 cup raw hazelnuts, skins on, finely chopped; 1/4 cup sugar; 1 teaspoon freshly grated nutmeg; 1/2 teaspoon cinnamon; 1 cup whole-wheat flour; 3/4 cup teff flour; 1/2 cup all-purpose flour; 1/2 cup granulated sugar; 1 tablespoon baking powder; 1/2 teaspoon baking soda; 1 teaspoon kosher salt; 1 cup buttermilk; 1/2 cup plain yogurt; 2 eggs; 1 teaspoon pure vanilla extract