In large bowl, mix flour, shredded coconut, sugar, baking powder and salt with electric mixer on low speed until combined, about 15 seconds. Add butter, 1 tablespoon at a time, continuing to beat on low speed until mixture looks dry and crumbly and largest chunks of butter are about 1/4 inch in diameter, about 30 seconds. Stop mixer and add half of liquid ingredients. Beat on low speed until flour mixture is moistened, about 15 seconds. Increase mixer speed to medium and beat until light and fluffy, about 45 seconds. With mixer still running, slowly stream in remaining liquid. Stop mixer and scrape sides and bottom of bowl. Beat on medium speed for an additional 30 seconds. Divide batter evenly into baking cups, filling about 2/3 full.