Line a sheet pan or a larger flat plate with waxed paper.
Cut each banana in half.
Insert a popsicle stick into the cut-end, and push the stick halfway in.
Place all the bananas on the waxed paper and freeze for 1 hour.
Add chocolate chips to a microwave-safe bowl and pour in the vegetable oil.
Melt the chocolate and vegetable oil in the microwave. DO NOT burn the chocolate. Check on it every 30 seconds and stir.
Put the dipping decorations (nuts, sprinkles) on flat plates.
Remove bananas from freezer.
Take one banana at a time and dip it in the chocolate, coating it completely – spoon some on, if needed.
Roll or sprinkle the dipped bananas with nuts, or sprinkles, or shredded coconut, and put them back on the waxed paper.
Put the bananas back in the freezer and freeze for 1 hour.