Peel some bananas and insert a stick. The bananas will most likely start to break, but it is okay, when they are frozen and covered in chocolate, you will never know. Put the bananas in the freezer and the let them freeze completely. 2 hours?
After the bananas are completely frozen, melt the chocolate chips in the microwave. Follow the directions on the bag for melting in the microwave. Add the vegetable oil and mix completely. The oil thins out the chocolate and helps it set up.
Cover the banana in chocolate.
Sprinkle with jimmies and put them back in the freezer to set completely.
Once they are frozen solid, they are ready for eating.