Preheat oven to 350°F (175°C), line an 8x8 pan with parchment, and lightly grease.
Whisk melted butter and sugar until glossy.
Beat in eggs one at a time, then add vanilla and melted coconut oil.
Whisk cocoa, flour, salt, and baking powder separately.
Gradually fold dry ingredients into wet.
Stir in ¾ cup shredded coconut (and chocolate chips if using).
Spread batter evenly, top with remaining coconut and flakes.
Bake 28–32 min until toothpick has moist crumbs.
Let brownies cool completely before cutting.