Brown Butter Espresso Chocolate Chip Cookies

Name: Brown Butter Espresso Chocolate Chip Cookies
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Cuisine: American
Ingredients: 1 cup unsalted brown butter (room temperature); 1 cup light brown sugar; 1/3 cup granulated sugar; 2 tablespoons espresso powder; 2 large eggs (room temperature); 1 tablespoon vanilla extract; 2 cups all purpose flour; 1 teaspoon baking soda; 1/2 teaspoon kosher salt; 1 cup dark chocolate wafers (or chocolate chips); flaky sea salt (optional )