I suppose you could try replacing the cocoa powder with another cup of AP flour and using about 1 1/2 cups blueberries in place of the chocolate. (brighteyedbaker.com)
Can I just ask what you mean by 1/2 cup blueberries divided? (eatingbirdfood.com)
I know it can't be much (just the honey I guess)-- just wondering, and I added 1 cup blueberries from our property to the recipe. (thecoconutmama.com)