In a large pot, melt butter and 7 cups of mini marshmallows on medium heat. Make sure you stir every 15-30 seconds until the two ingredients are combined.
Mix in vanilla.
Add in Rice Krispy cereal and mix until everything is coated in the marshmallow mixture.
Let sit for 1 minute to cool.
Add remaining marshmallows 1 cups at a time. Stir after each addition.
Let Krispy mixture sit for 1 minute.
Add 4-5 tbs. sprinkles and lightly mix.
Spray a 9x13" pan with PAM and then pour Krispy mixture into pan.
Spray PAM on your hands and press mixture down into the pan until it is one even layer.
Place in the refrigerator for at least 30 minutes.
Once the treats and cooled, cut them into individual servings and place them on a baking sheet lined with parchment paper.
In a microwave safe bowl, melt a handful of chocolate disks in 30 second increments, stirring between each heating.
Using a fork, drizzle white chocolate over treats and add sprinkles.
Let them sit until the chocolate has hardened, and then serve.