Preheat your oven to 350°F and line an 8x8 inch baking pan with parchment paper. While the oven heats, sift the erythritol through a fine-mesh strainer to remove any lumps—this ensures a smooth, lump-free batter and better texture in the final brownies. Measure out all remaining ingredients and have them ready before you begin mixing, as the batter comes together quickly.

In a microwave-safe bowl, combine 4 ounces of the dark chocolate with 2 tablespoons of coconut oil. Microwave in 30-second intervals, stirring between each burst, until completely melted and smooth. Let it cool to room temperature—this is important so the chocolate doesn't scramble the eggs when combined. In a separate bowl, whisk together the remaining 4 tablespoons coconut oil, sifted erythritol, whole egg, egg yolks, and mint extract for about 1 minute until well combined and slightly lighter in color.

Pour the cooled melted chocolate mixture into the egg and oil mixture from Step 2, stirring until fully incorporated and glossy. I find that the combination of melted and chopped chocolate creates a more complex, indulgent flavor—it gives you both a smooth chocolate base and those lovely little chocolate chunks throughout. Now stir in the chocolate protein powder, baking soda, salt, and espresso powder until just combined and no dry streaks remain. Pour in the vanilla almond milk and stir until the batter is smooth and homogeneous.

Coarsely chop the remaining 1 ounce of dark chocolate into small chunks and fold it into the batter from Step 3. Pour the batter into your prepared 8x8 inch pan, smoothing the top gently with a spatula. Bake for 20-21 minutes—the brownies should look slightly underdone on top with a gentle jiggle in the very center. Don't overbake; these brownies continue to firm up as they cool.

Let the brownies cool in the pan for 20 minutes—this resting period helps them set and makes them easier to slice without crumbling. Transfer the pan to a wire rack (or simply leave it on the counter) to cool completely before slicing. I recommend using a warm, dry knife to cut clean edges; wipe the blade between cuts for the best presentation.