Step One:

 Pour into a bowl 14oz of marshmallows.

Step Two:

Pour into a bowl 10½oz of Swedish Fish.

Step Three:

Pour into a bowl 26½oz of chocolate.

Step Four:

Cut the mini Swedish Fish in half. If you have regular-sized Swedish Fish, cut them into quarters. (If you have the mini marshmallows, you do not need to cut them. If you have regular-sized marshmallows, you will need to cut them into quarters.)

Step Five:

Combine the Swedish Fish and the marshmallows into a bowl and mix.

Step Six:

Add chocolate to your glass bowl.

Step Seven:

Get a spoon and mix the chocolate until it is all melted.

Step Eight:
Once melted, add the chocolate, marshmallows, and the Swedish Fish into a bowl. With a wooden spoon, mix together until everything is coated in chocolate.

Step Nine:

Pour the mix into the baking sheet and flatten out using the wooden spoon.

Step Ten:

Place in the fridge for 30 minutes or until the chocolate is hard and glued together.

Step Eleven:

Leave it out of the fridge for five minutes before cutting it into 4x4 to make 16 slices. Bonus points for eating a corner piece before they are all gone. 

Step Twelve:

Dish onto a plate and serve your three-ingredient dessert!