When Halloween baking needs to feel fun (not fussy), I reach for these easy ghost brownies. The base is deep, chocolatey black-cocoa brownies—no pumpkin spice, no fancy cuts. Then I spoon and pipe a marshmallow “ghost” silhouette on top, finish with dot eyes, and you’re done.
The best part is that the ghost shape is sheet-pan friendly: you’re not carving, cutting, or building decorations you’ll regret later. Just bake, cool, pipe, and pop into the fridge for set-up.
Why this works (and what you should look for)
Black-cocoa brownies: rich color, classic fudgy crumb
Black cocoa intensifies the chocolate flavor and gives that spooky dark look. For fudgy brownies, you want a set edge with a center that still looks slightly soft. Doneness cues: the edges should look matte and the center should not be wet—when you gently shake the pan, the middle should wobble like soft cake batter.
Marshmallow ghost tops: piping that holds its shape
Marshmallow fluff alone can be a little too soft to pipe. I stabilize it with a small amount of melted marshmallow (or egg-white powder, if you prefer). That extra “structure” helps your ghost silhouette keep its outline while it sets.
Method overview (quick game plan)
- Bake black-cocoa brownies in a lined sheet pan.
- Cool completely, then cut into squares.
- Mix stabilized marshmallow for piping, then pipe ghost silhouettes.
- Add dot eyes with black cocoa/charcoal gel or melted dark chocolate.
- Chill briefly to set before serving.
Step-by-step ghost decorating tips (no advanced skills)
Piping consistency: If your marshmallow mixture looks glossy and slowly falls off a spoon, it should pipe well. If it looks runny, chill it 5–10 minutes.
Ghost outline: Pipe a rounded top (like a cloud), then gently flare the bottom with a light back-and-forth motion. The silhouette doesn’t need to be perfect—ghosts are naturally a little wonky.
Dot eyes: Use a steady hand and minimal pressure. Two small dots are all you need for the “instant Halloween” effect.
Troubleshooting
- Brownies look underbaked in the center: Bake 3–5 minutes longer. You’re aiming for a set look with a soft wobble, not wet batter.
- Marshmallow ghosts won’t hold their shape: Your mixture may be warm. Chill the piping bag/mix 10 minutes, then try again. Also check you used the stabilizer (melted marshmallow or egg-white powder).
- Ghost tops melt or slump: The brownies may be warm. Make sure brownies cool fully before piping (room temperature is ideal).
- Eyes blur: Add eyes after chilling for 10–15 minutes, so the surface is slightly set.
Substitutions and options
- Marshmallow stabilizer swap: Use egg-white powder if you don’t want to melt marshmallows. (You’ll whisk it in with a little fluff and briefly microwave very gently if needed to help it combine.)
- Black cocoa: If you can’t find black cocoa, use Dutch-process cocoa for flavor and color. The brownies won’t be as inky, but the ghost vibe still works.
- Gel vs. chocolate for eyes: Black cocoa/charcoal gel is easiest for dotting. Melted dark chocolate works too—just let it cool slightly so it doesn’t run.
Storage
- Room temperature: Best within 1 day, especially if your marshmallow topping stays firm.
- Refrigerator: Store airtight up to 3 days. Let sit 10 minutes before serving for the brownies to soften.
- Freezing: Freeze baked brownies (without piping) up to 2 months. Thaw, then pipe ghosts fresh for best texture.
FAQ
Can I make these ahead?
Yes. Bake the brownies up to 2 days ahead, keep them covered at room temperature, and pipe the ghost tops the day you plan to serve.
Do I need a piping tip?
No fancy tip required. A small round tip helps with clean ghost silhouettes, but you can also use a zip-top bag with the corner snipped.
Are these pumpkin-spice brownies?
No. This version is black-cocoa chocolate-forward, so the flavor stays clean and spooky.
Will the ghosts set properly in humid weather?
They should, but chill time matters. If your kitchen is humid, pipe and then refrigerate a bit longer before adding eyes.
Print
Easy Ghost Brownies with Black Cocoa Marshmallow Ghost Tops
- Prep Time: 20 minutes
- Cook Time: 22 minutes
- Total Time: 1 hour 22 minutes
- Yield: 9 brownies (3x3 squares)
- Category: Brownies
- Method: Bake fudgy black-cocoa brownies, cool, pipe stabilized marshmallow ghost tops, add dot eyes, chill briefly to set.
- Cuisine: American
- Diet: Vegetarian
Description
Fudgy black-cocoa brownies topped with stabilized, piped marshmallow ghost silhouettes and simple dot eyes—Halloween dessert squares that are easy to make.
Ingredients
- Black cocoa brownies:
- 1/2 cup (113 g) unsalted butter
- 2/3 cup (135 g) granulated sugar
- 2/3 cup (55 g) black cocoa powder
- 1/4 cup (25 g) unsweetened cocoa powder (Dutch-process if possible)
- 1/2 cup (120 ml) brewed coffee or hot water
- 2 large eggs, room temperature
- 1 tsp vanilla extract
- 1/2 cup (65 g) all-purpose flour
- 1/4 tsp baking powder
- 1/2 tsp fine salt
- Marshmallow ghost tops:
- 1 cup (270 g) marshmallow fluff
- 2 tbsp melted marshmallows (or use 1 tbsp egg-white powder + 1 tbsp water, see Notes)
- 1/4 tsp vanilla extract (optional)
- Pinch of salt
- Dot eyes:
- 2 to 3 tbsp black cocoa/charcoal gel (preferred) or melted dark chocolate
- For the pan:
- Nonstick spray or parchment paper to line the pan
Instructions
- Preheat and prep: Heat oven to 350°F (175°C). Line an 8×8-inch (20×20 cm) baking pan with parchment, leaving overhang for lifting.
- Melt and combine: In a microwave-safe bowl (or on low heat), melt the butter. Whisk in granulated sugar, black cocoa, and unsweetened cocoa until it looks like a thick paste. Slowly whisk in the hot coffee (or hot water) until smooth and glossy.
- Add eggs and flavor: Whisk in eggs one at a time until the batter thickens and looks shiny. Stir in vanilla.
- Finish batter: Sprinkle in flour, baking powder, and salt. Fold just until no dry streaks remain. Do not overmix.
- Bake: Spread batter evenly in the pan. Bake 20–24 minutes, until the edges are set and the center looks slightly soft/wobbly (not wet).
- Cool completely: Cool in the pan at room temperature for at least 1 hour. For clean piping, refrigerate 15–20 minutes if needed—brownies should be cool, not warm.
- Cut into squares: Lift brownies out using parchment overhang. Cut into 9 squares (3×3) for thicker tops.
- Make piping marshmallow: Mix marshmallow fluff with melted marshmallows (or stabilized option—see Notes). Add vanilla (if using) and a pinch of salt. Transfer to a piping bag fitted with a round tip (or use a zip-top bag with a small snipped corner).
- Pipe ghost silhouettes: On each brownie square, pipe a rounded ghost top (like a cloud) with the nozzle hovering lightly. Finish with a slightly wavy/flared bottom so it reads as a ghost silhouette.
- Chill to set: Refrigerate 15 minutes so the marshmallow firms up.
- Add eyes: Dot two small eyes on each ghost using black cocoa/charcoal gel or melted dark chocolate. If using chocolate, let it cool 1–2 minutes so it dots cleanly.
- Serve: Serve chilled or at cool room temperature. Best within 1 day for the cleanest ghost texture.
Notes
Marshmallow stabilizer option: If you don’t want to melt marshmallows, use egg-white powder. Whisk 1 tbsp egg-white powder with 1 tbsp water, then mix into the fluff with a pinch of salt until smooth. If it seems stiff, stir in 1/2 tsp warm water; if too runny, chill 5–10 minutes. Piping troubleshoot: If your marshmallow is too soft, chill the piping bag for 5–10 minutes and try again. Doneness cue: If a toothpick comes out with wet batter, bake 2–3 minutes more; fudgy brownies can still cling slightly, but they shouldn’t look liquid.
