Preheat & Prep: Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.
Mix Dry Ingredients: In a medium bowl, whisk together flour, baking soda, and salt.
Cream Butter & Sugar: Beat the butter and brown sugar until smooth and fluffy.
Add Wet Ingredients: Mix in the egg, vanilla, and orange zest.
Add Dry Ingredients: Gradually add the dry ingredients to the wet mixture until just combined.
Stir in Chocolate Chips: Gently fold in the chocolate chips.
Scoop Dough: Drop spoonfuls of dough onto the prepared baking sheet.
Bake: Bake for 10-12 minutes or until edges are golden brown. Let cookies cool on a wire rack.
Make Espresso Swirl: Dissolve espresso granules in hot water. Add powdered sugar and stir until smooth.
Drizzle: Once the cookies are cool, drizzle the espresso mixture over each cookie.