Preheat oven to 350°F. Grease a 9x13-inch baking dish or line with foil or parchment paper.
In a large mixing bowl or the bowl of a stand mixer, add thick cut oats, flours, brown sugar, baking soda, melted coconut oil, eggs and vanilla and beat until combined and dough holds together (the dough will seem oily, this is good). Mix about 1 cup of the dark chocolate chunks.
Turn the batter out into a prepared pan, pushing the dough into the pan. Sprinkle on the remaining dark chocolate chunks.
Bake for about 20-25 minutes, just do not over bake. Bars will firm up as they cool. Allow bars to cool in pan for at least 30 minutes before slicing and serving.
One 9x13 pan, or about 18 bars
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