We started by lining up our alphabet cards in order. If you don't have alphabet cards you could quickly make some using index cards. This was the longest part of the activity and gave us the most alphabet practice since every time we added a card we started at the beginning of the alphabet to figure out which letter came next.
Once the alphabet cards were laid out, we sorted the candy by letter. We placed the candy bars under the letter card that corresponded to the first letter of the candy.
Our letter recognition activity evolved into a counting and math activity as we discussed which letters had the most candy. ("S" won, followed closely by "M".)
My 5 year old REALLY enjoyed this activity.
If you have a bunch of Halloween candy left, go check out Learn~Play~Imagine's candy series and Coffee Cups & Crayon's M&M experiment (you can make the "M" float!)
And if you're looking for more ways to use your alphabet cards, I've got 20 more ideas for you.