Preheat oven to 425 degrees. Butter 14 holes of three doughnut tins and set aside. In a mixing bowl, whisk together flour, baking powder, baking soda and salt for 30 seconds, set aside.
In a separate mixing bowl, using an electric hand mixer, blend together melted butter, vegetable oil, sugar and vanilla bean seeds until smooth, about 1 minute. Blend in eggs one at a time then mix in vanilla extract.
Working in three separate batches, beginning and ending with flour mixture, add 1/3 of the flour mixture alternating with half of the milk and mix just until combined after each addition. Spoon batter into buttered doughnut wells, filling them about 1/4-inch from the rim.
Bake in preheated oven 7 - 8 minutes, or until toothpick inserted into doughnut comes out clean. Transfer to a wire rack to cool until lukewarm then dip in glaze and return to wire rack, immediately top with sprinkles if using and allow glaze to set at room temperature.
In a flat bottomed bowl, whisk together powdered sugar, melted butter, vanilla and salt then stir in 2 Tbsp of milk, adding additional milk 1 tsp at a time to reach desired consistency and whisk until smooth. Tint with food coloring if desired.
Warm in microwave in 6 - 10 second intervals on HIGH power to warm as it begins to set while dipping doughnuts, as needed, whisking after heating.
Donut recipe adapted from King Arthur Flour
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