Morgan's Rice Krispy Treats

1 large bag marshmellows
1/3 C butter
1 t. vanilla
9 cups rice krispy cereal
blue food coloring

Melt butter in a sauce pan and add marshmellows. Stir until all marshmellows are melted. Stir in vanilla and add blue food coloring, enough to reach desired shade of blue. Stir in 9 cups of cereal, mix until all cereal is coated. Spoon mixture into greased 9x13 pan. Spray hands with PAM and press into pan. Let cool.

(Morgan's recipe uses the entire bag of marshmellows unlike the original rice krispy treat recipe which only uses about 2/3 of the bag)