Toasted Hazelnut Slice 'n' Bake Cookies with Milk Chocolate

Bahan-bahan (24 porsi)

• 3/4 cup (12 Tbsp; 170g) unsalted butter, softened to room temperature
• 2/3 cup (133g) packed light or dark brown sugar
• 1 large egg, at room temperature
• 1 teaspoon pure vanilla extract
• 2 cups (250g) all-purpose flour (spooned & leveled)
• 1/2 teaspoon ground cinnamon
• 1/4 teaspoon salt
• 1 cup (120g) toasted and finely chopped hazelnuts, divided*
• optional: coarse sugar for rolling
• 8 ounces (226g) milk chocolate, coarsely chopped*