In a medium-size bowl, cream together the butter and powdered sugar. Add the egg and vanilla. Mix well. Add the flour and mix until combined. Mix in the chopped cherries.
Divide the dough in two and roll each piece into a log that is about 2 1/2" in diameter. Wrap the log in plastic wrap and refrigerate for 1 hour.
Preheat the oven to 325 degrees.
Remove the plastic wrap and slice the dough into 1/2" thick slices.
Place the dough slices on a baking sheet that has been sprayed with cooking spray. Bake at 325 degrees for 12-13 minutes.
While the cookies are cooling, melt 8 ounces of Wilton candy melts according to package directions.
Pour some green nonpareil sprinkles on a plate. Dip the bottoms of the cooled cookies in the melted candy. Let the excess chocolate drip off, then carefully dip the coated cookie bottom in sprinkles. Place the decorated cookie on wax paper to set.