Serving size: 1 healthy rice krispie treat bar Line an 8×8-inch baking dish with parchment paper, ensuring that the paper goes up all 4 sides (to prevent sticking) and hangs over at least 2 sides (for easy removal). Lightly grease with butter.

1. In a large glass bowl, combine the marshmallows and butter. Microwave for about 30 seconds, then stir. Continue microwaving for 45-60 seconds longer, until almost fully melted. A few marshmallows may still be intact at this point; stir until completely smooth and melted.

2. Working quickly before the mixture cools, stir in the vanilla extract.

3. Immediately add half of the chopped cereal, stirring to combine. Then add the remainder 1 cup at a time, adding it to the areas where there is less cereal. Stir quickly before the mixture sets, as this happens very fast.

4. Transfer the mixture to the prepared baking pan and press gently. To prevent sticking, you can wet your hands with water, wash the rubber spatula, and spray it with cooking spray before using it to press down. Alternatively, use a sheet of parchment paper. Avoid packing the mixture too tightly, or your rice crispy treats will be dense and hard.

5. Cool completely in the pan for 30-60 minutes, until firm (avoid refrigerating, as they will harden too much).

6. Once cooled, use the edges of the parchment paper to lift the bars out of the pan. Transfer to a cutting board and slice into 16 squares.

   
   

Serving size: 1 healthy rice krispie treat bar