Cut up lettuce and pickle and put in a bowl. You can have your toddler do this or you can do it in advance. Put tuna and cheese in a bowl.
Mix together miracle whip and tuna
Smear tuna mixture on tortilla until it is covered
Add as much pickle, celery and cheese as you would like
Pop in the microwave for 20-30 seconds
Put lettuce on top. Roll it up!