Keto Thin Mint Cookies

I didn’t set out to make a copycat Girl Scout cookie. I was just trying to get peppermint and dark chocolate to work together in a keto cookie without that weird artificial aftertaste most sugar-free versions have. But after three years of adjusting ratios, swapping sweeteners, and making my family eat batch after failed batch, I landed on something that people keep mistaking for the real thing.

These are thick and chewy on purpose. Most copycat thin mint recipes go for a thin, crispy wafer dipped in chocolate. I tried that version. The almond flour crumbled, the coating cracked, and the whole thing tasted like a chocolate-covered crouton. So I went the other direction. A dense, fudgy cookie with the peppermint baked right into the dough. The texture is closer to a brownie bite than a wafer, and that’s exactly what makes it work.

The peppermint is the hardest part to get right. I landed on exactly 1.5 teaspoons of peppermint extract for a single batch. Even a quarter teaspoon over that and it tips from refreshing to medicinal fast. If you’re making a double batch, use 2 to 2.25 teaspoons, not the full 3. Peppermint compounds as the dough sits, so go lower than you think and taste the dough before scooping.

The dark chocolate base needs to be 70% cacao or higher. I use coconut oil instead of butter because it gives these cookies their chew without making them cakey. When you melt the chocolate, go slow (30-second intervals in the microwave) and let it cool before mixing into the dry ingredients. If the chocolate is too hot, it’ll seize up when it hits the almond flour.

I keep a batch of these in the freezer most weeks. They’re my go-to when I want something sweet after dinner that isn’t a fat bomb or a mug cake. If you like chocolate and peppermint together, you should also try my keto German chocolate cookies or my keto Neapolitan cookies for something with layers. For a simpler keto cookie starting point, my almond flour cookies use a similar base. And if you want the opposite vibe (no oven at all), my keto no bake cookies come together in about ten minutes.

What surprised me most is how well these pass the taste test with people who aren’t keto. One reader told me her dinner guests actually searched the table for a box they thought she’d opened. Another said her daughter had one, went quiet, and asked if there were more (she still doesn’t know they’re low carb). That’s the bar I was aiming for, and it took about 40 batches to get there. If you’re making these for the first time, trust the recipe. The dough will look dark and oily. That’s normal. They set up as they cool and the texture clicks at about the ten-minute mark on the wire rack.

Melt the chocolate slowly. I use 30-second intervals in the microwave and stir between each one. If you rush it, the chocolate seizes and you’ll end up with grainy lumps in the dough. Let it cool for a few minutes before combining with the dry ingredients.

The coconut oil is doing more than adding fat. It’s what gives these cookies their chew. I tested a batch with butter once and they spread too thin and came out crispy (the opposite of what I wanted). Stick with coconut oil for the right texture.

If you’re using cocoa powder instead of Cacao Bliss, add the monkfruit sweetener. Without it, the cocoa version leans bitter, especially with 70% dark chocolate already in the mix. I spent a few batches dialing in the monkfruit ratio because too much goes metallic. The amount listed in the recipe is where I landed after testing.

One thing I wish I’d known earlier: these cookies keep getting better in the freezer. The peppermint mellows slightly and the chocolate firms up. I pull one straight from the freezer and eat it cold. If you like copycat keto treats, my keto oatmeal cream pies have that same nostalgic quality. And my keto peanut butter cookies use a similar almond flour base if you want to try a different flavor profile.