Fill a Dutch oven about 3-4 inches deep with canola oil. Set over medium heat and cover. This should take about 20 minutes to heat to 350 degrees. But do temperature checks occasionally to monitor. Grab a baking sheet and line with paper towel or a rack. Set aside.
Add eggs, milk, melted butter, and vanilla to a small bowl. Whisk together. Set aside. Place flour, sugar, baking powder, salt, and cinnamon in a large bowl. Whisk together until combined. Add in wet ingredients and fold together. Add in chopped bananas and fold until combined.
Once the oil is 350 degrees, use a cookie scoop to scoop batter and release into hot oil. Do this about 5 more times. Cook for 4 minutes or until the fritters are a deep golden brown. Flip once or twice to fry the fritter evenly.
Once the fritters are done, remove from the oil and lay onto prepared baking sheet to cool. Repeat with the rest of the batter until gone.