Preheat your oven to 375 degrees.
In a medium sized bowl, combine your flour, baking powder and salt. Set aside.
In a large bowl, cream together your coconut oil and sugar for about 3 minutes until light and fluffy.
Add in your egg, sour cream, coconut, and vanilla extract and stir until combined.
Slowly add in your flour mixture while stirring until everything is combined. Dough is crumbly.
Press the dough into a greased 9x13 baking pan and spread out evenly.
Bake for 14-15 minutes until edges are barely a golden color.
Allow to cool completely.
Meanwhile mix together your butter, milk, vanilla extract, coconut extract and powdered sugar for your frosting until nice and creamy. Fold in about 1/3 - 1/2 cup of shredded coconut into your frosting.
Spread your frosting evenly over the top of your cooled cookie bars.
Sprinkle remaining shredded coconut evenly over the top.
Slice into squares and serve.