Easy Gluten Free Biscuit Donuts

recipe gluten free biscuit dough (I used the Extra Flaky Buttermilk Biscuits from page 227 of GFOAS Bakes Bread, but the Gluten Free Biscuits from the blog would work just fine, too—try using buttermilk in place of milk or cream), chilled

Oil, for frying (I used a combination of equal parts canola oil and Spectrum nonhydrogenated vegetable shortening)

About 1/2 cup (100g ) granulated sugar, for rolling