Keto Christmas Tree Cookies

These are my favorite holiday cookies to make every December. Three keto sugar cookies stacked on top of each other, separated by layers of bright green buttercream frosting, shaped into little Christmas trees. I’ve been making them since I first posted the recipe, and every year I fine-tune something small.

The cookie base is a gluten-free cut-out dough pressed flat in three different sizes. I use the bottom of a glass to flatten them to about 1/4 inch thick, and the key is refrigerating the flattened rounds before they hit the oven. I learned this the hard way: skip the fridge step and you get puddles, not circles. Five to fifteen minutes of chilling makes all the difference.

Each size bakes at a different time, and I’ve dialed in the exact minutes after dozens of batches. Large cookies go 7-8 minutes, medium 6, small 5. Pull them just before the edges start turning golden. They’ll feel soft (almost too soft), but they firm up completely as they cool. This is where patience matters: handle them too soon and they crumble apart.

The buttercream is simple. Softened butter, powdered sugar-free sweetener, a splash of heavy cream if it’s too thick, and green food coloring until the Grinch himself would approve. I pipe it between each layer using a star tip, and the texture holds the cookies in place surprisingly well. The stacking holds up way better than it looks like it will. I loaded mine with sprinkles all over the outside, and not a single tree toppled.

If you love holiday baking projects like I do, my keto Christmas tree cakes are the Little Debbie-style version, and my keto gingerbread house makes a full centerpiece. For a simpler weeknight cookie, my small batch keto sugar cookies use the same base dough without the assembly.

What makes these special isn’t just how they look (though they do turn heads). It’s that the cookie itself tastes like a real sugar cookie. The almond flour and coconut flour combination, with cream of tartar for lift, gives you that tender, slightly crumbly bite I spent years trying to nail down. The ratio is locked in.

Key ingredients and why they matter

• Almond flour: Use blanched, finely milled. This is the main flour and it needs to be fine or you’ll get a grainy cookie. I use the same flour in my almond flour cookies and it performs consistently. If you have a nut allergy, sunflower seed flour measures cup for cup, but I haven’t tested it in this specific recipe so I can’t guarantee the texture.
• Coconut flour: The second flour here, and I prefer this combination in most of my cookie recipes because it mimics all-purpose flour texture better than either flour alone. If you don’t like coconut, don’t worry. You can’t taste it in the finished cookie.
• Cream of tartar: This does double duty. It provides a slight tangy flavor that offsets the coconut flour, and it helps the cookies rise when paired with baking soda. I’ve made these without it and the texture falls flat.
• Unsalted butter: Do not substitute with margarine. I tested margarine once and the cookies spread into thin discs. Salted butter will make them overly salty. Stick with unsalted.
• Powdered sugar-free sweetener: Granulated sweeteners don’t dissolve well in baking and leave a gritty crumb. Powdered sweetener creates that delicate cookie texture I’m going for. Use one that measures cup for cup with powdered sugar. I also use it in my keto shortbread cookies for the same reason.