Preparation Steps

• Preheat oven to 375°F (190°C). Line a 12-cup muffin tin with paper liners or grease it well.
• In a large bowl, mash the ripe bananas. Stir in the melted butter and granulated sugar.
  3 medium ripe bananas
• Beat in the eggs one at a time, then stir in the vanilla extract.
  3 medium ripe bananas
• In a separate bowl, whisk together the flour, baking soda, salt, and ground cinnamon.
  3 medium ripe bananas
• Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Do not overmix.
• In a small bowl, combine the ingredients for the cinnamon swirl: melted butter, brown sugar, and cinnamon. Mix until well combined.
  3 medium ripe bananas
• Spoon about half of the batter into the prepared muffin cups. Dollop about a teaspoon of the cinnamon swirl mixture onto each.
• Top with the remaining batter, filling each cup about two-thirds full. Swirl the cinnamon mixture on top with a toothpick.
• Bake for 18-22 minutes, or until a toothpick inserted into the center of a muffin comes out clean.
• Let the muffins cool in the tin for a few minutes before transferring them to a wire rack to cool completely.