To Make the Donuts

Heat the oil in a deep pot in medium heat.

Mix dry ingredients. In a large bowl, combine all-purpose flour, sugar, baking powder, and salt and set aside.

Mix wet ingredients, then combine with dry. In a different bowl whisk together the sour cream, egg, olive oil, milk, and vanilla extract. Pour the wet ingredients into the dry and mix until a dough is formed.

Roll out dough. On a floured surface, roll out the dough to about 1/2 inch thickness.

Cut the donut shapes. Use a doughnut cutter or two differently sized biscuit cutters to cut out the donuts. You should get about 12 doughnuts.

Fry the doughnuts a few at a time, being careful not to overcrowd the pot. Fry on each side for about 2 minutes, being careful not to let them burn. Let drain on a paper towel to soak up the excess grease

To Make the Glaze

Mix glaze ingredients. In a medium bowl, mix the powdered sugar, hot water, and vanilla extract until smooth, with no lumps of sugar remaining.

Cover both sides of each donut with the glaze. Place on a wire rack above a sheet pan to catch any excess glaze. Let sit for 20-30 minutes.