Everyone and their mother can make Rice Krispies Treats. But since I've been complimented more than once on mine, I thought I'd do a post about them.
I always use mini-marshmallows since they melt faster than regular ones. It's very important to completely melt the marshmallows - make sure there are no lumps!
I add the Rice Krispies to the melted marshmallows slowly - by the cupful if possible. It's easier if you can have someone else add them while you stir the marshmallow mixture. You should stir the mixture very well - there shouldn't be blobs of marshmallows left before you pour it into the pan.
Instead of cooking spray, I butter the pan with A LOT of butter. Once I pour the mixture into the pan, I lightly butter my hands and press the mixture into the pan with bare hands. Once it's pressed,into shape, I flip the entire thing and press it again. This makes them both more buttery and prettier.
Sorry if these "tips" seem obvious, but I've found that small details in preparation can make a huge difference in the final product.