Preheat your oven to 350 degrees Fahrenheit (175 degrees Celsius) and grease a 24-cup mini muffin tin.
Add the whole wheat flour, rolled oats, baking soda, and salt to a large bowl and whisk to combine.
To a large liquid measuring cup, add the eggs and whisk them with a fork to break up the yolks. Add the canola oil, the grated carrot, the grated zucchini, grated apple, and the mashed bananas and mix with a spoon until all the wet ingredients are combined.
Pour the wet ingredients into the bowl with the dry ingredients and fold everything together using a rubber spatula just until no streaks of flour remain.
Drop about a tablespoon of the muffin batter into each of the prepared mini muffin cups and bake at 350 degrees Fahrenheit (175 degrees Celsius) for about 18-22 minutes or until the muffins are a nice golden brown.
Remove them from the oven and from their tin and let them cool completely on a cooling rack before enjoying!