I use real butter. It tastes better than margarine. You can tell a difference. I make double the recipe for the same size pan that others use, so mine are thicker. I also leave out 1/2 cup of Rice Krispies, so mine are more gooey. I also don't mind if I leave an almost melted marshmallow or two in the mixture. It adds texture and no one minds biting into marshmallow goodness.
Spray 9x13 pan with Pam or lightly grease with butter
6 T. butter
11 1/2 cups Rice Krispy Cereal (you can use store brands)
80 regular sized marshmallows (that is 2 standard bags)
Melt the butter over medium heat, stir in the marshmallows and keep stirring until they are melted. They will scorch easily, so keep stirring and turn them down to low heat if necessary. Remove from heat and quickly stir in Rice Krispies. Scoop into the greased pan and pat down with fingers. Cool slightly (if you can wait that long) and cut into squares. Enjoy!
*Mom hint-It works very well to wet your fingers under the faucet before pressing the mixture into the pan. You may need to wet them a few times as you press. It will keep your fingers from sticking to the treats.