1

Preheat the oven to 325 degrees. Grease the inside of the jars with butter or non-stick spray, and place them on a sheet pan.

2

In a large mixing bowl, cream together the sugar and softened butter. Mix in the eggs, mashed bananas, and add the vanilla extract and sour cream.

3

Add the flour, baking soda, cinnamon, and salt to the bowl, and mix until everything is combined. Fold in any add-ins, such as chocolate chips or nuts.

4

Use an ice cream scoop or measuring cup to transfer batter to each jar, filling each one halfway. If there are spills, simply wipe the tops of jars clean.

5

Place the sheet pan with jars in the oven and bake for about 45 minutes until a toothpick inserted comes out clean.

6

While the jars are in the oven, boil the rings and lids in water on the stove for about five minutes and then let them cool and dry.

7

Remove the jars from the oven after baking and secure the sterilized rings and lids tightly on the jars while they're still hot. While the jars cool, you'll hear popping sounds as they "seal". Cool to room temperature, gift them, and/or enjoy at home!