In a large mixing bowl, stir together the peanut butter and honey (see note).
Pour the peanut butter mixture over rice cereal and stir until well-coated. Press the bars into a parchment-lined 8x8 inch pan. Press the mixture FRIMLY into the pan. Refrigerate for at least 4 hours, preferably overnight or freeze for at least an hour.
Slice into 16 squares using a sharp knife (a serrated knife works really well) and enjoy!
Store leftovers in the fridge or the freezer if you're not planning to eat them right away.
Notes
You want to make sure the peanut butter and honey is well combined and smooth. Here are 3 ways:
The easiest way: In a large bowl, combine ROOM temperature peanut butter and honey. The mixture needs to be completely smooth and runny.
Microwave: Heat in a large microwave-safe bowl in 20 second increments, stirring between each, until smooth. Should take about 40-60 seconds
On the stove: heat in a small saucepan over low-medium heat, stirring frequently until the mixture is smooth. Don't raise the heat or the mixture will burn or overharden.