Using a Piano Wire Whisk, whisk all ingredients until smooth. Set aside.
Preheat oven to 400° F (205°C).
In a bowl, using a Piano Wire Whisk, whisk first 4 ingredients.
In a second bowl, using an electric mixer, beat butter and sugar until creamy. Add eggs one at a time, beating well after each addition.
Slowly mix in dry mixture and milk in batches: 3 batches dry; 2 batches milk mixed with vanilla. Be careful not to over mix.
Using a basting brush, lightly brush Mini Donut Pan with vegetable oil. Pipe or spoon dough into Donut Pan, filling wells 2⁄3 full.
Bake until a toothpick comes out clean, approximately 12–15 minutes. Repeat with remaining batter.
Dip one side of each donut in glaze, and twist clockwise to coat.
Place plain side down on a cooling rack, and sprinkle generously with white chocolate sprinkles, if using.
Let glaze set before serving, approximately 5 minutes.