Step 1: Preheat your oven to 350°F (175°C).
Step 2: Lightly grease your donut pan with non-stick spray or butter.
Step 3: In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, cocoa powder, espresso powder, baking powder, and Kosher salt until well combined.
Step 4: In a separate bowl, whisk together the buttermilk, eggs, melted butter, and vanilla extract until smooth.
Step 5: Pour the wet mixture into the bowl with the dry ingredients. Gently fold the mixture together until just combined.
Step 6: Fill each donut cavity about ¾ full with the batter.
Step 7: Place the donut pan in the preheated oven and bake for 10-12 minutes.
Step 8: Remove the pan from the oven and let it cool for a few minutes before transferring the donuts to a cooling rack.
Step 9: In a small saucepan, heat the heavy cream over medium heat until it begins to simmer. Remove from heat and add the semi-sweet chocolate chips. Stir until smooth.
Step 10: Dip the top of each cooled donut into the chocolate glaze and sprinkle with colorful sprinkles if desired.
