Here’s the fun, slightly messy part. I place the wire cooling racks over a sheet of parchment paper (to catch drips). Working with one cookie at a time, I either carefully dip the top directly into the glaze or spoon the glaze over the top, using the back of the spoon to nudge it to the edges. If I’m using pecans, I sprinkle them on immediately after glazing each cookie, before the glaze sets. Then, I just let them sit until the glaze firms up into that perfect, shiny shell. The patience required is the hardest part of the whole recipe!
Pro Tips for Best Results
Room temperature ingredients are your secret weapon here. I take my eggs and buttermilk out about an hour before I start. When they’re cold, they can cause the creamed butter to seize up, resulting in a denser cookie. I tested this side-by-side, and the difference in the rise and tenderness was noticeable. Letting your ingredients warm up ensures everything emulsifies smoothly into that perfect, airy batter that bakes up with an ideal texture.
Don’t overbake. I know it’s tempting to wait for a firm cookie, but trust your senses. At around 10 minutes, start peeking. The edges will be set, and the tops will be matte and covered in fine cracks. When you gently press the center, it should offer a slight give. They will continue to cook from residual heat on the hot baking sheet. I overbaked my first batch by just two minutes, and while still tasty, they were more cakey than fudgy. That soft center is magic.
When making the glaze, sift your powdered sugar. I know it feels like an extra bowl to wash, but I’ve learned the hard way that skipping this leads to a lumpy glaze. There’s nothing worse than getting a mouthful of undissolved sugar grit. A quick sift ensures it blends seamlessly into the warm butter-cocoa mixture for a flawlessly smooth, professional-looking finish that sets like glass.
For the most beautiful cookies, glaze them while both components are still warm. I glaze my cookies when they’ve had just 5 minutes to cool on the pan—they should be cool enough to handle but still release warmth. The warm glaze on a warm cookie creates a slight melding that ensures it adheres perfectly and sets with a lovely, thin, crackable shell. If the cookies are completely cool, the glaze can sit on top a bit too thickly and may not adhere as well.
Common Mistakes to Avoid
The biggest mistake is not giving the cookies enough space on the baking sheet. I made this error in my first test run, placing them only 2 inches apart. They baked into one giant, misshapen cookie sheet! Three inches is the absolute minimum. They spread like little puddles of chocolate goodness as they bake, and they need room to become perfect rounds. If you’re unsure, bake in smaller batches. It’s worth the extra time for perfectly formed cookies.
Another common pitfall is using cold butter for the glaze. The recipe calls for melting butter with milk and cocoa. If your butter is straight from the fridge and you try to melt it too quickly on high heat, you risk burning the milk or scorching the cocoa. Use medium-low heat and patience. Gentle melting and constant whisking lead to a velvety base for your glaze. Rushing this step can give it a bitter, burnt taste that no amount of powdered sugar can fix.
Avoid overmixing the dough once you add the dry ingredients. As soon as you no longer see streaks of flour, stop the mixer. Overmixing develops the gluten in the flour, which can lead to tough, chewy cookies instead of the tender, cake-like texture we’re after. I fold in the last bit of flour by hand with a spatula just to be safe. It makes a noticeable difference in the final crumb.(See the next page below to continue…)