I am sorry to say that there is no way to really eat brownies and cookies without concern. Since brownies and cookies are not real whole foods, they should be eaten only occasionally, and not on a regular basis. Adding cinnamon to counter the effects of rising blood sugar is not the answer. Cinnamon is used to regulate blood sugar levels in people who are not eating a lot of sugar. It can't be applied in the way that you are suggesting.
I'm not familiar with the mix you are asking about, but I do know that evaporated cane juice is not the healthiest sugar. You would do better to use a brownie recipe from a cookbook and substitute the processed and refined ingredients with whole wheat pastry flour, Rapadura sugar, unsweetened baker's chocolate and unsweetened cocoa powder. You never want to use olive oil in a recipe for baking. Use coconut oil instead, your brownies will taste wonderful.