Preheat the oven to 350℉.
In a bowl, smash the banana, then whisk in the eggs, milk, vegetable oil, vanilla extract and lastly the sugar. Now, mix in the bisquick into the wet ingredients.
Pour the batter into a lined loaf pan. Place into the oven and bake for 45-55 minutes depending on the oven.
When it's finish, the top will be golden and you can put a toothpick in the center and it come out clean. Remove from the oven when ready and allow to cool before slicing.
Once cooled, slice the banana bread and enjoy.