Line an 8x8-inch square baking pan with parchment paper or foil, and set aside.
Stir together the oats, Rice Krispies, and cinnamon.
In a large microwaveable bowl, add the peanut butter, and honey and heat in 20 second intervals until the peanut butter is runny and can be combined easily with the honey. Stir in the vanilla.
Fold in the oats mixture until evenly coated. Use your hands if you need to. Fold in 3/4 cup (130g) of the chocolate chips. Don't worry if they melt a little against the warm mixture.
Press the mixture firmly into the prepared pan (use your hands), then press the remaining chocolate chips on top.
Cover, and refrigerate for at least 2 - 3 hours before removing and cutting into bars.
Notes
Leftovers can be stored at room temperature for 1 week or in the fridge for 2 weeks. These bars also freeze well for up to 3 months. Thaw overnight in the fridge before eating.