Start by preheating your oven to 350°F (175°C). This ensures that your cookies will bake evenly.
In a medium-sized saucepan over low heat, combine the chopped unsweetened chocolate and salted butter. Stir continuously until melted and smooth. Remove from heat and let it cool slightly.
In a large mixing bowl, whisk together the melted chocolate mixture, pure maple syrup, pure vanilla extract, and eggs. Make sure everything is well combined and smooth.
In another bowl, mix the buckwheat flour, baking powder, and fine sea salt. Gradually add this dry mixture into your wet ingredients, stirring until just combined.
Gently fold in the dark chocolate chips, ensuring they are evenly distributed throughout the cookie dough.
Line your baking sheet with parchment paper to prevent sticking. Using a tablespoon or cookie scoop, drop rounded balls of dough onto the prepared baking sheet, spacing them about 2 inches apart.
Before placing the cookies in the oven, sprinkle a pinch of coarse sea salt on top of each cookie. This step is crucial for that delightful sweet-and-salty contrast.
Bake in the preheated oven for 10-12 minutes. The cookies should look slightly underbaked in the center; they will continue to cook on the baking sheet after being removed from the oven.
Allow the cookies to cool on the baking sheet for about 5 minutes before transferring them to a wire rack to cool completely. Enjoy these cookies warm, or store them for later!