In a large mixing bowl, whisk together the sugar, flour, cocoa powder, baking soda, baking powder, and salt.
2 cups flour, ¾ cup sugar
Add in the egg, vanilla, melted butter, yogurt, and milk until thoroughly mixed. The batter will be a little liquidity and its okay because placing it in the fridge will help. Cover bowl with plastic wrap and place in the fridge for 20 mins.
¼ cup coco powder, 1 egg, ¼ cup yogurt, ¼ cup milk
In the mean time, heat up some oil in deep pot or dutch oven on med/low heat.
Take bowl out of the fridge and sprinkle some flour on a clean work space. Knead the dough and add more flour as needed to form a dough ball. Roll out 1/2 inch thick and use a round cookie cutter or drinking glass to make donut rounds.
Place donut rounds in the oil and cook 1-2 mins until donuts are golden brown. Place on paper towel to cool and dip into the glaze.