Preheat oven to 350 degrees F.
Mash bananas with a fork.
Soften butter in a microwave.
Lightly beat eggs.
Stir bananas, butter, eggs & sugar together until totally blended together.
Mix in remaining ingredients (except the cranberries). Stir until batter is completely mixed.
Add the cranberries to the batter. Stir in the cranberries until fully mixed into batter.
Place paper muffin baking cups (liners) inside the muffin trays. Or grease the muffin trays if you are not using muffin baking cups or non-stick muffin trays.
Add the batter to the muffin baking cups until each one is about 50-75% full with batter.
Place muffin trays into the oven.
Bake muffins for 25-30 minutes or until golden brown.
Remove the muffin trays from the oven. Use oven mitts when removing the muffin trays.
Allow the muffins to cool for 5 minutes within the muffin trays.
Remove the muffins and place them on a cooling rack in order to completely cool.
