Preheat your oven to 350°F (175°C). Grease a mini muffin pan or line with mini paper liners.
Silicone pans work best for easy release.
In a medium bowl, whisk together 1 cup almond flour, 1/3 cup unsweetened cocoa powder, 1/2 cup granulated keto sweetener, 1/2 teaspoon baking powder, and 1/4 teaspoon sea salt. If using espresso powder, add 1/2 teaspoon now.
Melt 6 tablespoons unsalted butter and let it cool for a minute so it’s warm, not hot. In a separate bowl, whisk together the butter, 2 large eggs, and 1 teaspoon vanilla extract.
Pour the wet mixture into the dry ingredients.
Stir until just combined and smooth. The batter will be thick and glossy.
Fold in 1/3 cup sugar-free dark chocolate chips. Don’t overmix.
You want the chips evenly distributed.
Scoop the batter into the mini muffin pan, filling each cup about 3/4 full. If you like, sprinkle a pinch of flaky sea salt on top.
Bake for 10–12 minutes, until the tops are set but still slightly soft in the center. A toothpick should come out with moist crumbs, not wet batter.
Cool in the pan for 10 minutes, then gently remove and transfer to a rack to finish cooling.
They’ll firm up as they cool, keeping that fudgy bite.