Preheat oven to 350 degrees F. and lightly spray a 15 x 10 inch baking sheet with cooking spray.
Place butter into a large saucepan over medium heat. Swirl to melt and let cook until browned while swirling often. Generally takes 5-8 minutes to brown, watch carefully. Remove browned butter from heat and transfer to a heat proof bowl. Let butter cool for 15 minutes before using in recipe.
Place warm butter into a large mixing bowl. Add brown sugar and granulated sugar, mixing until well combined. Add eggs and vanilla, beating until smooth and combined. Stir in flour, baking soda and salt until dough forms. Stir in chocolate chips then transfer dough to prepared baking sheet, pressing evenly into bottom of pan. Place granulated sugar and cinnamon into a small bowl, stirring to combine. Sprinkle evenly on top of cookie dough. Bake for 22-25 minutes, until baked through and edges turn golden. Let cookies cool completely.
When cookies are cooled, spread top with white frosting then sprinkle with shredded coconut and blue sprinkles. Cut cookies into squares and serve.