step 1
Melt the Butter in a saucepan.
step 2
Add the Marshmallows and cook over a low heat until melted.
step 3
Remove from the heat before stirring in the Vanilla, and the Coco Pops.
step 4
Using a moist spoon, press the mixture into a greased square pan or tub.
step 5
Leave to set for 30 minutes and cut into 8 pieces.