Pre-heat your oven to 350 degrees Fahrenheit. Then, peel the bananas and put them into your mixing bowl.
Using the whisk attachment, run this for about a minute until the bananas are niced and mashed up.
Then, place the butter in a microwave safe bowl and heat for about 10-20 seconds until melted. Add this to your mashed bananas in your mixing bowl.
Next, add both the brown sugar, the granulated sugar, and the eggs and mix until smooth for about a minute. Add your vanilla and baking soda next and mix until fully incorporated.
Finally, you will add the flour 1/2 cup at a time, making sure to mix well between each addition. The last step is to add the drained pineapples to the batter and stir until they are evenly distributed.
Pour the batter into a greased loaf pan or ceramic non-stick loaf pan and cook for 55-60 minutes. Rotate half-way through the cooking time.