mini banana walnut cakes

I love the bite-size and this is amazingly moist and flavorful! Thanks to food network

• 1 1/4 cups plain flour
• 1 teaspoon baking soda
• 1/2 teaspoon fine salt
• 2 large eggs, at room temperature (i omitted this)
• 1/2 teaspoon vanilla extract (i used 3/4 tablespoon)
• 1/2 cup unsalted butter, at room temperature, plus more for preparing the pan (i used canola oil)
• 1 cup sugar (i reduced it to 1/4 cup white sugar + 1/4 cup brown sugar)
• 3 very ripe bananas, peeled, and mashed with a fork (about 1 cup) (i used 2 large bananas)
  
• 1/2 cup toasted walnut pieces

Makes 16 mini muffins