Step 1: Preheat and Prepare – Preheat your oven to 350°F (175°C). Lightly grease two 6-cavity donut pans with non-stick cooking spray or a little bit of butter to ensure the donuts release easily after baking.
Step 2: Whisk Dry Ingredients – In a large mixing bowl, whisk together the all-purpose flour, cocoa powder, baking soda, salt, and granulated sugar until there are no lumps and the mixture is uniform.
Step 3: Mix Wet Ingredients – In a separate medium bowl, combine the buttermilk, vegetable oil, egg, vanilla extract, red food coloring, and white vinegar. Whisk until the color is deep red and the egg is fully incorporated.
Step 4: Combine the Batter – Gently pour the wet ingredients into the dry ingredients. Use a spatula or a whisk to mix them together until just combined. Be careful not to overmix, as this can make the donuts tough.
Step 5: Fill the Pans – Transfer the batter to a piping bag or a large plastic bag with the corner snipped off. Pipe the batter into the prepared donut pans, filling each cavity about two-thirds full.
Step 6: Bake and Cool – Bake for 10 to 12 minutes, or until a toothpick inserted into the thickest part comes out clean. Let the donuts cool in the pan for 5 minutes before transferring them to a wire rack to cool completely.
Step 7: Prepare the Frosting – While the donuts cool, beat the softened cream cheese, powdered sugar, and milk together until smooth and creamy. The consistency should be thick enough to stay on the donut but thin enough to dip.
Step 8: Glaze the Donuts – Dip the top of each cooled donut into the cream cheese glaze. Set them back on the wire rack so the glaze can set for a few minutes.
Step 9: Add the Vampire Bites – Use a wooden skewer or a small straw to poke two holes near the top of each donut, about an inch apart. Warm the raspberry or strawberry jam slightly and use a small piping tip or a toothpick to fill the holes and let a little bit “drip” down the side like blood.