Preheat oven to 350 degrees. Grease the doughnut pan with extra butter or cooking spray and set aside.
In a small bowl, whisk together the flour, sugar, baking powder and salt. Set aside.
Combine the milk, butter, vinegar, vanilla extract, vanilla seeds and egg in a small saucepan over medium heat. Stir constantly until the butter melts.
Add butter mixture to flour mixture and with a wooden spoon, stir to combine. When the mixture is combined, fold in the cherries.
Spoon or pipe the mixture into the prepared doughnut pan. Bake for 13-14 minutes until the finished doughnuts edges come off the pan. Remove from oven and let cool for 1 minute, then finish cooling on rack. If using the same pan again, wait 5 minutes before filling the pan a second time.
Vanilla Glaze
Combine all ingredients in a small bowl with a wire whisk. Wait 1-2 minutes for the glaze to thicken before dipping the doughnuts in the glaze.