You can also use 2 cups of fresh grated zucchini in this recipe but it might not "decompose" in the cake quite as much and you may need to add a bit of extra liquid.
The carbs from the oat flour come out to 4.4 net carbs/serving if you cut the cake into 10 slices (those are big slices). This is well within Trim Healthy Mama S guidelines. To avoid using oat flour, use my Baking Mix variation.
To use Briana's Baking Mix in this recipe, substitute 1½ cups of Briana's Baking Mix for the oat fiber, oat flour, and flaxmeal called for in the recipe. Add ¼ cup of egg whites.