Add dry ingredients to the wet, fold together until well combined without over mixing. Fold in vinegar.
Pour or pipe batter into a greased donut pan. Bake for 10-15 minutes. Remove from pan onto a cooling rack. Allow the donuts to cool completely before adding glaze.
Once the donuts are cool place chocolate, oil, agave and salt in a bowl. Microwave for 30 seconds, or until everything is melted, then whisk until everything is combined well.
Dip donuts into chocolate glaze and place back on the cooling rack.
Before the glaze sets, place eyes, nose, and pretzels, this way the glaze will dry and the toppings will stick better. Once the glaze is set they are ready to enjoy!