Place the all ingredients but the mix-ins in a blender
or the bowl of a food processor fitted with the steel blade: oats, bananas, eggs, Greek yogurt, honey, baking powder, baking soda, vanilla extract, and salt. Blend or process on high, stopping to scrape down and stir the ingredients once or twice as needed, until the batter is smooth and the oats have broken down almost completely, about 3 minutes. By hand, stir in the mix-ins. If the batter is warm from the appliance’s motor, the chocolate chips may melt and swirl as they are stirred. If this bothers you, let the batter cool for 10 minutes before adding them.