Set your oven to broil.
Create a base: Scoop about 2 tablespoons of graham cracker crumbs into the bottom of each jar.
Scoop a couple of tablespoons of pudding over each base.
Sprinkle about 1 tablespoon of toffee chips over the pudding.
Scoop another few tablespoons of pudding over top.
Repeat as many times as desired {or as much as will fit in the container you're using}, leaving some space at the top for the marshmallow fluff.
Scoop about ¼ cup of marshmallow fluff to top each trifle. Place the jars on a small cookie sheet and place directly under broiler to toast the marshmallows -- keep an eye on them, they tend to brown quickly! {You could probably also do this with a mini blow torch, the type you'd use for creme brulee... but I don't have one of those, so this method worked for me.}
Serve immediately & make sure to dig deep with each spoonful to get each of those yummy layers!