Cookies: * 1 1/2 cups flour * 1 1/2 teaspoons baking powder * 1 teaspoon baking soda * 1 cup brown sugar, firmly packed * 1 cup unsalted butter, softened * 1 egg * 1 cup rolled oats * 1 cup flaked coconut * 1 cup salted peanuts * 1/2 cup corn flakes, finely crushed Drizzle Icing: * 2 tablespoons unsalted butter * 1 cup confectioners' Sugar * 1 tablespoon water, hot * 1 teaspoon fresh lemon juice