Place your egg whites in a stand mixer with the vinegar and whip until stiff peaks. This should take about 10-15 minutes. Set aside.
Place the egg yolks in a high powered blender with the remaining ingredients and blend until smooth.
Spoon some of the yolk mixture into the whipped egg whites. Do this in 3 batches until combined.
Pour batter into each cavity of the donut pan.
Bake on the middle shelf of oven for 15 minutes. Allow to cool before adding frosting.
Vanilla Frosting
Place frosting ingredients into a large mixing bowl or a large bowl for a stand mixer and blend with the paddle attachment or electric hand mixer until smooth. Taste and adjust sugar substitute to see if you need it sweeter.Spread frosting onto each donut and if you desire, add sugar-free sprinkles.