Heat oven to 350 degreesSpray different sized mason jars or glass jars with PAM baking spray. Make sure to remove anything from the glass jar that might melt in the oven.

In a mixer, cream butter and sugar until light and fluffy. Beat in vanilla. Add the eggs, one at a time, scraping down the sides while adding the eggs.

In a large bowl, sift together flour, baking soda, and salt. Whisk milk into reserved cocoa mixture.

With mixer on low speed, alternately add flour and cocoa mixtures to the batter, a little of each at a time, starting and ending with flour mixture.

Divide batter into mason jars and fill them up 1/2 way. Place mason jars onto a baking sheet and put into oven on the middle shelf. **Here is where is gets a little tricky** Check on the cakes in a jar every 7-10 minutes to see when they are done. Depending on the size of the jars you used the cakes can take anywhere from 10 - 25 minutes. You'll know when they are done by inserting a knife into the center of the cake and if it comes out clean. Remove the cakes in a jar from the oven and let cook.

Heat oven to 350 degrees

Spray different sized mason jars or glass jars with PAM baking spray. Make sure to remove anything from the glass jar that might melt in the oven.

In a large mixer cream the butter and the sugar together. Add the eggs one at a time and scrape down the sides in between. Add the milk and the bananas on low speed. Finally add the flour, baking soda and chocolate chips.

Divide batter into mason jars and fill them up 1/2 way. Place mason jars onto a baking sheet and put into oven on the middle shelf. **Here is where is gets a little tricky** Check on the cakes in a jar every 7-10 minutes to see when they are done. Depending on the size of the jars you used the cakes can take anywhere from 15 - 30 minutes. You'll know when they are done by inserting a knife into the center of the cake and if it comes out clean. Remove the cakes in a jar from the oven and let cook.