Brown Butter Cookie Cake With Salted Maple Buttercream

Ingredients

• 1 cup (226 grams) salted butter, plus more for pan
• 2 1/4 cup (270 grams) all-purpose flour
• 1/2 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/4 teaspoon kosher salt
• 3/4 cup (160 grams) packed dark brown sugar
• 1/2 cup (99 grams) granulated sugar
• 2 tablespoons pure maple syrup, plus more for drizzling
• 1 teaspoon pure vanilla extract
• 2 large eggs, room temperature
• 1 1/2 cup semisweet chocolate chips, plus 1 tablespoon chopped for garnishing
• Coarse salt, for sprinkling over top
• 1/4 cup salted butter, softened
• 1 cup loosely packed powdered sugar
• 3 tablespoons pure maple syrup
• 1/2 teaspoon pure vanilla extract
• 1 pinch kosher salt