- Preheat oven to 350ºF. Lightly grease a 6-cavity donut pan with cooking spray. In a medium bowl, whisk together flour, cocoa powder, baking powder and salt, then set aside.
- In a separate large mixing bowl, whisk together melted butter, brown sugar, granulated sugar and vanilla extract.
- Add milk and egg and whisk until just combined. Gradually whisk in flour mixture until batter is smooth.
- Spoon batter into a large resealable bag and cut one corner. Pipe batter into the prepared donut pan, filling each cavity ¾ full. Bake for 11-12 minutes. Cool donuts in pan for 20 minutes.
- While donuts cool, heat chocolate chips, cream and sriracha in a medium bowl over a pot with some simmering water to create a double boiler. Stir until mixture is smooth and glossy, about 6-7 minutes. Dip cooled donuts in chocolate ganache. Place on a wire cooling rack until chocolate is firm.