Spoon several tablespoons of graham cracker crumbs into the bottom of the glass cups or jars.
Transfer mousse into a resealable bag.
Squeeze the mousse into the corner of the bag and cut the tip off.
Squeeze mousse into the cups, on top of the crust, filling about ¾ of the way up.
Place cups into your refrigerator for at least 1 hour to set.
Prepare the jello according to package instructions, replacing the cold water with ice water to cool down the jello faster.
Add fresh or frozen raspberries, or whichever fruit you are using, on top of the mousse, as many as you like.
Then carefully pour the jello on top. Fill the cups up to their edge.
Place in refrigerator to set completely, between 4-6 hours, if not longer. Keep refrigerated until ready to serve with some fresh mint! Enjoy!