01 -
Preheat your oven to 350°F (175°C). Prep your mini muffin or donut hole pans by lightly coating them with butter or cooking spray so nothing sticks.
02 -
Mix the cocoa powder, salt, baking soda, baking powder, and flour in a big bowl. Stir until everything’s evenly spread out.
03 -
Take another bowl and mix your melted butter with both sugars until they’re creamy and blended. Toss in the eggs, extra yolk, and vanilla. Stir until smooth.
04 -
In a small bowl or measuring cup, stir sour cream into the milk until smooth. This keeps the batter moist and soft.
05 -
Add some of the dry mix, then some of the milk mix, and keep alternating while mixing. Start and finish with the dry stuff, and be gentle so you don’t over-stir.
06 -
Use a little cookie scoop or a spoon to fill each pan slot about three-quarters of the way full, giving space for the mix to rise.
07 -
Pop them in the oven for about 10 minutes. Check with a toothpick—if it comes out clean or with a few crumbs, they’re done. Let them cool in the trays a bit, then move to a wire rack.
08 -
As your treats cool, mix the powdered sugar, milk, and vanilla in a medium bowl. Adjust the thickness by adding small splashes of milk until it’s pourable but still thick.
09 -
Once cooled down, dunk each donut hole into the glaze and let the extra drip off. Place on the rack to set, and for extra sweetness, give them another dip after the first coat dries.