It is best to use fresh marshmallows. I buy mine at Dollar Tree. The marshmallows and butter can be melted in a pan on the stovetop or in the microwave. I did mine in a pan on the stovetop. The chocolate pieces in the cereal will melt slightly, so mix quickly when you add the hot marshmallow mixture to the cereal.
For a variation add 1/2 c. coarsely chopped nuts.
These are slightly softer than Rice Krispie Treats.
Special K Chocolately Delights Treats
1 box (13.1 oz.) Kellogg's Special K Chocolately Delights Cereal
1/4 c. butter
1 (10 oz.) pkg. fresh marshmallows, regular or mini
Pour cereal into a large bowl and crush slightly with your hands. Set aside. Line a 9x13-inch baking pan with foil and spray with non-stick spray. Set aside. Place butter in a large pan and melt on the stovetop. Add marshmallows and cook and stir until they are completely melted. Pour over cereal in bowl and mix quickly until cereal is well coated. Pour into prepared pan and spread evenly. Let cool and cut into bars. About 24 bars.