Hazelnut Cookies With Milk Chocolate Recipe

Name: Hazelnut Cookies With Milk Chocolate Recipe
Ingredients: 7 ounces whole hazelnuts, toasted and skinned (about 1 1/3 cups; 200g); 4 ounces unsalted butter, pliable but cool, about 60°F (8 tablespoons; 115g); 10 1/2 ounces plain or lightly toasted sugar (about 1 1/2 cups, 295g); 1 1/2 teaspoons (6g) Diamond Crystal kosher salt; for table salt, use about half as much by volume or the same weight; 1 teaspoon baking powder; 1/2 teaspoon baking soda; 1/8 teaspoon freshly grated nutmeg; 1/2 ounce vanilla extract (1 tablespoon; 15g); 1 large egg, straight from the fridge; 9 ounces all-purpose flour, such as Gold Medal (about 2 cups, spooned; 255g); 6 ounces dark or milk chocolate, not chips (about 1 heaping cup, roughly chopped; 85g), tempered