In a food processor, add cashews, honey, maple syrup, and vanilla extract. Process for a few minutes, until mixture becomes a cohesive, slightly sticky mass. The cashews will have very few (if any) tiny pieces remaining and the mixture might be a little warm from the processing (see note below).
Place cashew mixture into a bowl and add rice cereal and oats. Using your hands or a wooden spoon, if you prefer, work in the cereal and oats until combined evenly throughout the cashew mixture.
Press mixture into the bottom of a small pan, such as a 9" x 5" loaf pan. Depending on the consistency, you may prefer to refrigerate bars for 15-20 minutes before slicing to ensure they have solidified. Bars will hold up at room temperature, however if storing for several days, I'd keep them in the refrigerator in the meantime.
Notes
*Note: Step #2 may be easier if the cashew mixture is warm. If mixture isn't as workable as you'd like right out of the food processor, place cashew mixture in a small saucepan over low-medium heat until heated a bit. Then remove from heat and proceed with the cereal and oats.
Nutritional information is provided as an estimate. As it can vary due to many factors (brands used, quantities, etc.), we cannot guarantee its accuracy.