Kinda H&FR: Recipe for homemade 'Clif' bars?

[Brit]

Has anyone made them? Specifically, has anyone made them with a nut-free spread (i.e. Sunbutter, Wowbutter, etc.)? I have had good luck making them for H and I with peanut butter as a binder, but DD can't take PB to her nut-free daycare. When I sub Sunbutter or Wowbutter the bars just crumble apart. Any ideas or recipes?