Ingredients
Equipment
Method
Prepare dry and wet mixes
- Preheat oven to 350°F and lightly spray a 12-donut pan with nonstick spray; in a medium bowl whisk together 2 cups flour, 2 teaspoons baking powder, 1/2 teaspoon baking soda, 1/2 teaspoon salt, and 1/2 teaspoon cinnamon.
- In a large bowl whisk 1 cup sugar and 2 eggs until smooth, then whisk in 1/4 cup vegetable oil, 1 cup sour cream, 1 teaspoon vanilla, and lemon zest.
Combine and rest
- Add the dry ingredients to the wet and fold gently with a spatula until just combined with a few streaks of flour remaining; toss 1 cup blueberries with 1 tablespoon reserved flour and fold into batter in three gentle turns; let batter rest 10 minutes.
Fill and bake
- Transfer batter to a piping bag and pipe into the donut wells about three-quarters full; bake at 350°F for 10–12 minutes until tops spring back and a toothpick has a few moist crumbs; cool in pan 2 minutes then transfer to a rack.
Make glaze and finish
- Simmer 1/2 cup blueberries with 2 tablespoons water until they pop, press through a fine-mesh strainer to yield about 2 tablespoons juice; whisk juice with 1 cup powdered sugar and 1–2 teaspoons milk to a pourable glaze; dip donut tops and let set 10–15 minutes.
Notes
Do not overmix the batter—fold until just combined for a tender crumb. If using frozen blueberries, thaw and pat dry before tossing with flour. Unfrosted donuts freeze best; freeze cooled unglazed donuts on a sheet then transfer to a bag for up to 2 months and refresh in a 325°F oven for a few minutes before glazing.
