Step 1: Preheat the Oven and Prepare the Baking Sheet
Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
Step 2: Mix Dry Ingredients for Cookies
In a bowl, whisk together flour, baking soda, salt, and cinnamon.
Step 3: Cream Butter and Sugars
Beat butter, brown sugar, and granulated sugar until fluffy.
Step 4: Add Wet Ingredients
Beat in the egg and vanilla extract.
Step 5: Combine Wet and Dry Ingredients
Gradually add the dry ingredients to the wet mixture. Mix until just combined.
Step 6: Stir in Chocolate Chips and Hazelnuts
Fold in chocolate chips and chopped hazelnuts.
Step 7: Shape the Dough
Drop spoonfuls of dough onto the baking sheet, spacing them about 2 inches apart.
Step 8: Bake
Bake for 10-12 minutes, or until golden around the edges. Let cool.
Step 9: Prepare the Espresso Ripple
In a saucepan, dissolve espresso powder in heavy cream over low heat. Stir in powdered sugar.
Step 10: Drizzle and Serve
Drizzle the espresso mixture over the cooled cookies.