This holiday treat has become a seasonal tradition in our house: Christmas Tree Brownies that are as much fun to decorate as they are irresistible to eat. I first made these on a sleepy December afternoon when the kids wanted to bake and I wanted something quick, chocolaty, and festive. What started as a way to use a basic brownie batter soon turned into a ritual — we bake, chill, cut, and then everyone gets a turn piping garlands and choosing sprinkles. The brownie base stays fudgy and brownie-rich while the iced decorations add a playful crunch and sweetness that kids (and adults) adore.

These are particularly special because they combine a straightforward, dependable batter with an easy decorating method that’s perfect for little hands. The batter is forgiving — you won’t ruin it if you over-mix a touch — and the icing is nothing more than powdered sugar thinned with a splash of milk, split into green and white for piping. What makes this recipe memorable is not just the final result, but the time spent decorating together, the laughter when a tiny hand snags an extra sprinkle, and the proud smiles when everyone’s tray of trees looks unique. Serve them warm with a glass of milk or boxed up as neighborly gifts.

Ingredients

• All-purpose flour: 3/4 cup — use a spoon-and-level method when measuring for consistent density; King Arthur or Bob's Red Mill both perform well.
• Cocoa powder: 3/4 cup — natural unsweetened cocoa creates a deep chocolate flavor; for a slightly darker, more intense taste, use Dutch-processed cocoa.
• Kosher salt: 3/4 teaspoon — enhances the chocolate and balances the sweetness; Diamond Crystal or Morton's fine is fine here.
• Unsalted butter: 15 tablespoons, melted — measuring in tablespoons keeps this accessible; melt to just liquid and cool slightly to avoid scrambling the eggs.
• Granulated sugar: 1 1/2 cups — helps create a slight crackly top while keeping the interior fudgy.
• Vanilla extract: 2 teaspoons — pure vanilla lifts all the flavors; try Nielsen-Massey for a reliable result.
• Large eggs: 3 — room temperature eggs incorporate more easily and give a glossy sheen to the baked top.
• Powdered sugar (for icing): 1 cup — sift if lumpy for the smoothest icing.
• Milk: 1–2 tablespoons — start with 1 tablespoon and add more to reach piping consistency.
• Green food coloring: a few drops — dye-free options work well for families avoiding artificial dyes.
• Holiday-themed sprinkles: quantity to taste — choose a mix of nonpareils, stars, and small shapes for visual impact.

Instructions

Preheat and prepare: Preheat the oven to 325°F. Grease a 9×13-inch baking pan and line it with parchment so you can lift the whole slab out later. This makes cutting shapes much cleaner and reduces waste. Mix dry ingredients: In a medium bowl, whisk together 3/4 cup all-purpose flour, 3/4 cup cocoa powder, and 3/4 teaspoon kosher salt until homogenous. Set aside — this prevents over-mixing when added to the wet ingredients. Combine wet ingredients: In a large bowl using a hand mixer or stand mixer, beat 15 tablespoons melted unsalted butter with 1 1/2 cups sugar and 2 teaspoons vanilla until smooth. Add the 3 large eggs one at a time, beating briefly after each addition just until incorporated; overbeating will incorporate excess air and change the texture. Combine and bake: Slowly fold the dry mix into the wet mixture with a spatula or on low speed just until no streaks of flour remain. Pour into the prepared pan, smooth the top, and bake at 325°F for 30 minutes. Insert a toothpick into the center — it should come out with a few moist crumbs for fudgy brownies. Allow to cool completely in the pan on a wire rack. Cut tree shapes: Once fully cool, lift the slab using the parchment and place it on a cutting board. Use a Christmas tree-shaped cookie cutter and cut shapes starting at the edges, fitting cutters close together to maximize yield. Chilling the slab for 30–60 minutes makes crisper, cleaner cuts. Make icing and decorate: In a small bowl, stir 1 cup powdered sugar with 1–2 tablespoons milk to reach piping consistency. Split the icing into two bowls; tint one with green food coloring. Transfer each to a small zip-top bag, press icing into a corner, remove excess air, seal, and snip a tiny hole. Pipe zigzags of green and white across the tree shapes and immediately add sprinkles so they adhere before the icing sets.

Storage Tips

For the freshest texture, keep undecorated trees in a single layer in an airtight container at room temperature for up to 48 hours. If you need longer storage, freeze undecorated pieces in a single layer on a baking sheet, then transfer to a freezer bag with parchment between pieces — they'll keep for up to three months. Thaw at room temperature before decorating. If already iced, refrigeration helps keep the icing intact for up to five days; bring to room temperature before serving for the best flavor.

Ingredient Substitutions

Swap melted butter with an equal amount of neutral oil (vegetable or canola) for slightly softer edges and a dairy-free option, though flavor will be less buttery. For a gluten-free version, use a 1:1 gluten-free flour blend and ensure cocoa and other ingredients are certified gluten-free. Replace eggs with a commercial egg replacer or 3/4 cup unsweetened applesauce combined with 1 tablespoon vinegar for each egg (note: texture shifts toward cakier). Use dairy-free margarine and a plant-based milk for the icing to make the decorations dairy-free.

Serving Suggestions

Present the trees on a platter lined with parchment and garnish with small candy canes or edible glitter for parties. Pair with hot cocoa, mulled cider, or whipped cream for an indulgent plate. For an after-dinner platter, alternate sizes and add a few salted caramel squares to balance the sweetness. They also travel well in bakery boxes for gifting.

Cultural Background

Decorating baked goods is a holiday tradition across many cultures. Shaped sweet breads and cut cookies were historically used to celebrate seasonal festivals; this brownie adaptation modernizes that idea by pairing a classic American chocolate treat with festive shapes. The tree motif nods to evergreen symbols of winter solstice festivities and has become a universal emblem of holiday cheer in contemporary baking.

Seasonal Adaptations

In winter, add a pinch of ground cinnamon or espresso powder to the batter for warmth and depth. For spring or other holidays, change the cutters and icing colors — pastel or floral sprinkles for Easter, orange and black for Halloween. Swap cocoa for white chocolate chips and tint the icing accordingly for a snowy, elegant look at winter parties.

Meal Prep Tips

Make the brownie slab a day ahead and chill it overnight for easier cutting. Prepare the icings in small containers and keep them covered in the refrigerator; they’ll stay pipeable for a day. If preparing for a cookie exchange, freeze undecorated trees and transfer to the exchange frozen — they’ll thaw and keep structure while being transported.

These Christmas Tree Brownies are about community as much as they are about flavor. The best part is seeing everyone’s unique decorations — no two trees look the same, and that’s the point. Make a double batch for larger gatherings and let everyone decorate a few to take home.