I don't often give "cookie" type treats and there are lots of great ideas on the internet. I like to make jerky and have a dehtdrator. Jerky can also be made easily without a dehydrator in your oven.
Slice chicken breast in to thin slices, lightly salt and place on baking tray.
Cook in 250° oven for 4 - 5 hours, prop oven door slightly using wide end if wooden spoon.
Jerky should be bendable but not crispy when done.
Store in refrigerator in airtight container and freeze any amount you will not use within one week.
My guys go nuts over this stuff!