In a large bowl, combine oats, peanut butter, honey, and vanilla.
Add in chocolate chips and other mix-ins (or more oats).
If you only have whole flaxseed, you can use a coffee grinder to grind it.
When all ingredients are thoroughly mixed, use a spoon or small cookie scoop to create 1" balls.
Place balls on a cookie sheet and refrigerate until firm (30-60 minutes). Refrigerate leftovers in a covered container.
OR, freeze balls on cookie sheet for 1-2 hours and store in a covered container.
