Preheat oven to 350°F and line your cupcake/muffin tin with desired liners.
In a medium bowl mash the bananas with a fork, leaving them slightly lumpy, and set aside.
3 Bananas
Add the mashed bananas, oil, sugar, eggs, vanilla and sour cream into a medium sized bowl and whisk together.
⅓ cup Neutral oil, 1 cup Granulated sugar, 2 Eggs, 2 teaspoons Vanilla extract, ½ cup Sour cream
Sift dry ingredients together and give them a quick whisk. Gently mix dry ingredients into the wets, making sure to not overmix.
1 teaspoon Baking soda, 1 teaspoon Kosher salt, 1 ½ cups All-purpose flour
Fold in fresh raspberries and chopped walnuts. Pour batter into muffin liners until they are ⅔ full then top with additional nuts or berries if desired. Use a piece of foil to tent over the top of the muffin tin to protect the tops while allowing the muffins to bake fully if they start to brown too quickly.
1 cup Fresh raspberries, ½ cup Chopped walnuts
Bake for 28-33 minutes, or until the muffins are set and when a toothpick is inserted into the middle, it comes out with only a few crumbs.
Allow the muffins to cool for about 10 minutes, then place them on a cooling rack to cool completely before storing - or enjoy immediately!