In a large mixing bowl, whisk together flour, sugar, cocoa powder, baking powder, soda and salt.
¾ cup all-purpose flour, ¼ cup unsweetened cocoa powder, ¼ cup granulated sugar, 1 teaspoon baking powder, ¼ teaspoon baking soda, ¼ teaspoon salt
In a large measuring cup, mix together buttermilk, egg, vanilla and oil. Whisk well.
¼ cup + 3 Tablespoons buttermilk OR ¼ cup + 2 Tablespoons whole milk with 1 Tablespoons apple cider vinegar, 1 large egg, ½ teaspoon pure vanilla extract, 1 Tablespoon vegetable oil
Add wet ingredients to dry ingredients and whisk until smooth, about 2 minutes.
Place the batter in a ziploc bag. Close the bag and cut off a corner with scissors. Pipe out the batter evenly among donut cups in your pan.
Tap the pan against your counter few times to release any air bubbles.
Bake donuts in preheated oven for 8 to 10 minutes or until the toothpick inserted in few places in each donut comes out clean.
Cool donuts in pan for 5 minutes, then transfer onto a cooling rack.
To make the glaze, place chocolate chips in a medium mixing bowl. Pour heavy cream into heat-proof measuring cup or bowl and heat up in the microwave in 20 second increments just until hot, but not boiling. Pour hot cream over chocolate. DO NOT stir. Let it sit for 5 minutes. Whisk the mixture until smooth.
¾ cup semi-sweet chocolate chips, ¼ cup heavy whipping cream
Dip donuts in glaze and set back on cooling rack. Decorate with sprinkles while the glaze is still wet.
Notes
Please note, that the nutrition value can vary depending on what product you use. The information below is an estimate. Always use calorie counter you are familiar with.