Preheat the oven to 375 degrees. Grease 24 regular muffin cups, or line with paper liners.
In a large bowl, whisk together the eggs, applesauce, oil, brown sugar, vanilla and bananas.
In a medium bowl, combine the flour, baking powder, salt and cinnamon; stir into the banana mixture until just moistened. Gently fold in the strawberries and chocolate chips (if using).
Spoon batter into muffin cups, filling 2/3 full. Bake for 18-20 minutes, or until the tops of the muffins spring back when pressed lightly. Allow to cool on wire racks before removing from the muffin tins.