In a medium mixing bowl, stir together the buckwheat, cocoa powder, baking powder, baking soda, and salt. Set aside.
In a large mixing bowl, using an electric hand mixer or a stand mixer fitted with the paddle attachment, beat together the sugar, eggs, almond butter, melted coconut oil or butter, and vanilla until well combined. Add the flour mixture and beat just until combined. Stir in 1 1/2 cups (255 grams) chocolate chips. The dough will be thick and sticky like brownie batter.
Wrap the dough in plastic wrap and refrigerate for 2 hours or until firm enough to roll into balls.
Preheat the oven to 350°F (175°C) and line a baking sheet with a piece of parchment paper. Roll the dough into 1 1/2-inch (4 cm) balls and place 3 inches (7 1/2 cm) apart on the baking sheet. Press the remaining 1/2 cup (85 grams) chocolate chips onto the top of the balls, if desired. Bake for 8 to 11 minutes or until the tops of the cookies are no longer wet in the middle.
Let cool completely on the baking sheet. Store in an airtight container at room temperature for up to 4 days.