Preheat the oven to 350 degrees F. Line a standard 12-cup tin with cupcake liners and lightly spray the liners. You can spray the pan directly if you don't have cupcake liners.
Place the oats, bananas, eggs, Greek yogurt, honey, baking powder, baking soda, vanilla extract, and salt in a blender and blend on high until the mixture becomes smooth. Scrape and stir the mixture at intervals to ensure everything is well blended, about 3 minutes.
Stir in the chocolate chips or any other mix-ins.
Pour the batter into the muffin cups about three-quarters full to give room for rising. Sprinkle with additional chocolate chips or nuts as desired.
Bake for 18 to 20 minutes or until a toothpick inserted in the center comes out clean.
Remove from the oven and place on a wire rack to cool for about 10 minutes. Remove from the pan and enjoy!