I know this is an old thread, but I've done these lots more times and figured out a pretty good system in the process, I've come a long way from my first effort

I have tried to answer questions via PM's over the years, but figured I should just go ahead and post my tips and tricks with the original post

hope this helps!
The CC's in a jar make such a cute and fun gift, people really feel special when they get them.
I tell people for best taste eat them within a few days or put the in the refrigerator for up to a week and just let them warm to room temp before eating.Or freeze them and thaw to room temp before eating. When I ship them I tell them to refrigerate or freeze as soon as they arrive.
I got the Kerr/Ball wide mouth 1/2 pint mason jars at Albertson's grocery store for $10 for 12.
http://us.st12.yimg.com/us.st......19_5426044
The first time I made them (
http://cakecentral.com/cake-decorating-ftopict-606603-jar.html ) I baked regular sized cupcakes in liners and then cut them all in half (top & bottom). I used 3 cupcake slices per jar to get a good fill; they were a lot smaller round than the jars so there was still room around the outside, which accounts for some of the filling spilling down the sides and getting messy looking.
Since then I switched to the Jumbo size cupcakes and when cut, filled and layered they fit in these jars perfectly!!! I use a LARGE scoop to fill each Jumbo size liner. Oh my gosh, what a difference the jumbo size made! I cut each in half and layer them in the jars with whatever candy, nut, frosting, topping combo.. I use sleeve filling and buttercream to try to keep them as shelf stable as possible because I mail them. I boil the jars and lids and let them cool before filling.Once assembled, I just screw the lids on tight and I tie a spoon to the top of each with ribbon. (I use Torani flavored syrups to enhance the different buttercreams, just play around with the flavors its fun)
Some of the flavor combos Ive done;
Snickers: Chocolate cake/ Caramel (sundae topping)/ Chopped honey roasted Peanuts/ Buttercream (peanut butter syurp)/ Chopped bite sized Snickers on top.
Mounds: White Cake/ Toasted Coconut/ Dark Chocolate Chips/ Buttercream(coconut syurp)
Dipped Strawberry Shortcake: White Cake/ Buttercream(white chocolate or chocolate syurp)/ Strawberry Sleeve filling
Peanut Butter Cup: Chocolate Cake/ Buttercream (peanut butter syurp)/ Chopped-Up PB Cups
Red Velvet: Red Velvet Cake/ Buttercream (cream cheese syurp)
Black & White: Triple Chocolate Cake/Buttercream/ Chocolate Jimmies
Pumpkin: Pumpkin Spice Cake/ Buttercream (cream cheese syurp) or Chocolate Buttercream
Bliss: Lemon Cake/Buttercream / Raspberry Sleeve filling
Boston Creme: Chocolate Cake/Barvarian Cream Sleeve Filling/ Chocolate Buttercream