Blend 1/2 cup berries with a scoop of avocado and 3/4 cup soy milk. (health.com)
If blueberries are in season, or if frozen blueberries are available, gently combine 1/4 cup berries into the batter just before baking. (saffrontrail.com)
My issue is with carb count I've checked all my sources and I Come up with 4 net with 1/2 berries and 5 with whole cup berries. (homemadeinterest.com)