Dark Chocolate Hazelnut Biscotti

Name: Dark Chocolate Hazelnut Biscotti
Prep time: 10 min
Cook time: 50 min
Total time: 1 h
Cuisine: American, Italian
Ingredients: 1/2 cup unsalted butter (room temperature); 1/2 cup granulated sugar; 1/2 cup brown sugar; 2 large eggs (room temperature); 1 teaspoon vanilla extract; 1/2 teaspoon almond extract (optional); 2 cups all purpose flour; 1/4 cup hazelnut flour (substitute all purpose flour); 1 1/4 teaspoon baking powder; 1/4 teaspoon salt; 1/2 cup toasted hazelnuts (chopped); 4 ounces dark chocolate (melted); 1/4 cup chopped hazelnuts; flaky sea salt (optional)