Dry Ingredients. In a medium bowl, use a whisk to combine together the buckwheat flour, cornstarch, and baking soda.
Wet Ingredients. In a large mixing bowl, combine together the oil, brown sugar, granulated sugar, and vanilla extract. Beat or mix the ingredients until well combined (about two minutes on low in a stand mixer).
Combine. Scrape down the sides of the large mixing bowl and then add the dry ingredients to the bowl. I like to use a rubber spatula or similar item to combine these ingredients as the cookie batter will get soft and thick. You can use your mixer if desired.
Chocolate. Lastly, fold in the chocolate chunks.
Chill. Cover and refrigerate the dough for at least 30 minutes (or overnight if desired).
Prepare. When you are ready to bake your cookies, preheat your oven to 375°F and prep your baking sheet(s) for nonstick. Parchment paper can work in this recipe.
Scoop Use a medium or large cookie scoop (depending on how large you want your cookies to be) to scoop out the dough and then roll the dough between your hands. Place the rolled cookie dough about 2 ½ inches apart on your prepared sheet(s).
Bake. Bake your cookies for 10-12 minutes or until that begin to turn golden brown on top and appear to be set on the edges.
Cool. Allow the cookies to cool on the baking sheet for 10 minutes before transferring them to a cooling rack to fully cool. Note that these cookies will lose a bit of volume while cooling, which is to be expected from them