Use over-ripe bananas to make these tasty, slightly sweetened Blueberry Banana Oat Muffins. This post contains affiliate links.  Super excited to share this tasty muffin recipe with you all today! Featuring one of my favorite fruits, the tiny but mighty blueberry, these muffins are simple to make. And while we all know that over-ripe bananas make the perfect banana muffins, why…