Gather all ingredients. Preheat the oven to 350 ℉ (175℃). Line muffin pan with cupcake liners or lightly grease (I use Wilton cake release) a 9x5-inch loaf pan. I got 11 muffins with this batter with no add-ins. You'll get more if you add nuts or chocolate chips.
Combine flour, baking soda, and salt in a large bowl.
Beat brown sugar and butter with an electric mixer in a separate large bowl until smooth. Stir in vanilla, eggs, and mashed bananas.
¾ cup brown sugar, ½ cup butter, 2 large eggs, 2 cups bananas, 1 teaspoon pure vanilla extract
Stir the banana mixture into the flour mixture until just combined. Don't over-mix.
Pour batter into the prepared muffin pan.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 24 minutes.
Eat plain or top with butter while they're hot. Enjoy!
Notes
Two cups of bananas equal three 8-inch bananas. I measured unpeeled bananas.You can add to this basic recipe. Try one cup of either nuts, chocolate chips, walnuts, or raisins. Or, add 1/2 teaspoon of cinnamon or 1/4 teaspoon of freshly grated nutmeg.