
Preheat the oven to 350 degrees F and grease a 9x5-inch loaf pan with nonstick spray. (I use classic Pam.)
Add the butter, bananas, eggs, and vanilla extract to a large bowl. Stir to combine.
Stir in the flour, sugar, baking soda, cinnamon and salt.
Pour batter into the prepared pan and smooth the top with a spatula so it's even. Bake for 55-60 minutes or until golden brown and a cake tester inserted into the center comes out cleanly.
Cool in the pan for 5 minutes, then remove from pan (carefully) and let cool on a wire rack completely.
Slice and serve.