I put pumpkin spice in my oatmeal. I use a bunch, it’s a commercial blend. I use maybe a tablespoon in one cup dry oatmeal cooked in two cups of water. It’s not that strong.
Is there a law that says Treats can’t be made with cereal other than Rice Crispies? I could go for some Trix Treats 
No law. Lots of cereal brands have been used for these treats.