Fry donuts in batches for about 1 minute per side, flipping carefully with a spatula or spoon.
Remove donuts to a cooling rack with a paper towel-lined baking sheet underneath so the extra grease can drip off. Adjust the temperature of the stove burner to maintain a steady temperature for the next batch.
Coat warm donuts in the glaze on all sides. Set them back on the rack to cool and for the glaze to set.
Notes
Flour: To properly measure the flour either weigh it or sift or stir to break it up, lightly spoon into a measuring cup, and level. Avoid packing the flour as that will give you heavy, dry donuts.
Butter: You can use salted butter and 1/4 teaspoon kosher salt (or 1/8 teaspoon table salt).
Oil: Be sure to use an oil designed for frying, like canola, sunflower, or avocado oil.
Milk: You can use any milk from whole milk to skim milk. Whole milk will give you a richer glaze.
Donut holes: Donut holes can also be fried. They’re a bit more buoyant so you may need to press them gently into the oil to keep them submerged.
Nutrition values are estimates and are for 1 doughnut + 1 doughnut hole.