I found this adorable idea at A bit of this and a bit of that and we tried it tonight. It made a nice little intermission from our movie night.
We gave Spud:
Butter knife and cutting board
Banana, peeled
Nutella [warmed in the microwave for 20 seconds]
Sprinkles
He did the rest. Slice, dip, dip, slurp. And then he named them mini pies after declaring his perpetual love for them.