Glazed Chocolate Donuts

Preheat the oven to 325 degrees F (165 degrees C). Spray 11 donut cups with cooking spray.

Mix flour, sugar, cocoa powder, baking powder, baking soda, and salt together in a bowl. Beat in 3/4 cup plus 2 tablespoons milk, eggs, 2 tablespoons melted butter, and vanilla extract using an electric mixer. Beat until well blended.

Pour batter into a zip-top bag and cut off 1 corner. Fill each donut cup about 3/4 full using the zip-top bag.

Bake in the preheated oven until a toothpick inserted into a donut comes out clean, about 10 minutes. Allow to cool slightly, 5 to 10 minutes.

While donuts cool, combine 1/4 cup butter, cream, milk, corn syrup, and vanilla extract in a small saucepan over medium-low heat until butter is completely melted, 2 to 3 minutes. Reduce heat to low and stir in bittersweet and semisweet chocolate until melted, 2 to 3 minutes more. Remove from heat and whisk in powdered sugar to combine. Dip each cooled donut into the glaze and let cool and set, about 15 minutes.