Help me find a muesli bar recipe that doesn't collapse

[Palmface]

I've tried two recipes, one that was no-cook (like a slice, held together with honey and chia seeds), and the other was a baked one, with butter and chia seeds to bind. A base of oats, with seeds and dried fruit.

Both just collapse at room temp.

Any ideas? No nuts or sesame seeds as they're going in preschool lunchboxes.

Thanks

I switch between this recipe which uses flour, and this one. Both have nuts in the recipe, but I’ve made both without (replacing with extra seeds and dried fruit) and they’ve worked fine.