Starting at the bottom, I draw temporary guide lines at these positions: 3/4", 1-1/8", 1-7/8", and 2-1/4". The space up to the 3/4" mark is on the back (plain). The space between the two bold marks is the first slanted side. The space between the italics marks it the other slanted side. The space between the two slanted sides is 3/4" for your main messge or picture. And of course the remaining 3/4" at the top goes to the back.

Draw a little sketch of the 1.25" x 3" label, then cut it out and try it on your little Hershey bar to see how it fits. That might make it clearer. You can probably make a little box that size in most drawing or desktop publishing packages. Give it a try.

Once you get the box the way you want it, just duplicate it to fill your page.

I did browse various Avery, etc. labels to see if there was one that size, but didn't see any. Check your computer programs - they might have newer label dimensions than mine.

If you can find a label the right size, you could just use the label paper and stick the printed labels right to the candy bar wrapper. If you do it the first way (custom sizing on just regular paper), you have to cut the labels apart, then use a glue stick to attach them to the candy bars.