Grease an 8x8-inch pan with oil. You can line the pan with parchment paper so it’s easier to unmold the treats later. I didn’t do that during my recipe testing, but I wish I did. Set the pan aside.
In a large bowl, mix together the rice krispies cereal and the chili rice crackers.
Pour the sesame seeds into a small pan. Heat on medium for 2 to 3 minutes, stirring occasionally. You should be able to smell a faint aroma of the toasted seeds and maybe see small whiffs of smoke coming up the sides of the pan. Turn off the heat and carefully transfer the seeds to a bowl.
Before melting the butter, make sure you have your marshmallows measured out and situated near the stove. In a large pot, melt the butter over medium heat. Once the butter melts completely, reduce the heat slightly and continue heating the butter for 1 to 2 more minutes. Once you start noticing tiny golden specks at the bottom of the pot, stir the butter with a silicone spatula frequently. Keep your eye on the pot because the butter can burn easily at this stage. Continue heating the butter until more golden specks of milk solids form and then turn brown, like the color of milk chocolate. Turn off the heat. Leave the pot on the burner.
Immediately pour the marshmallows into the pot and start stirring. Keep stirring until the marshmallows have melted completely. Add the sesame seeds and stir to combine.
Pour half the cereal and rice cracker blend into the pot. Then sprinkle half of the furikake over the cereal mixture. Add the remaining cereal and rice cracker mixture and then the remaining furikake. Use a silicone spatula to mix the dry and wet ingredients together. I like using a silicone spatula for this because the marshmallow mixture doesn’t stick to the spatula.
Transfer the cereal mixture into the prepared baking pan. Place a small sheet of parchment paper over the cereal mixture and pack down the mixture into the pan. Try your best to distribute everything evenly.
Let the rice krispies cool for 10 minutes. Flip the entire pan over a chopping board and tap the pan on the chopping board until the rice krispies treats unmold. You may need to tap the pan quite a few times. If you lined your pan with parchment paper, simply hold on to the parchment paper to remove the entire block of treats from the pan.
Using a sharp knife, cut the treats into squares. I like to slice the block of rice krispies treats into 5 strips and then cut each strip into 4 pieces for a total of 20 treats.
The texture of the treats are best the day they’re made. Store the treats in an airtight container. They will keep for 3 to 4 days.