Definitely an acute case of pfb syndrome!
We all had our moments op.
But yea you kinda need to get over yourself and be more realistic.
The point re the porridge is it IS also processed you're not feeding her raw oats straight off the ears of the grass it grows on!
Almost all food is processed to some degree with the exception of fresh meat, fish, fruit and veg.
Bread, milk, applesauce... 
Blueberry muffins are huge cakes for crying out loud! Far more sugary and fatty and processed than a healthy wholegrain cereal with milk!
My understanding (never having been there but have family there) is that both food and childcare standards and regulation in USA is far more lax than here.
My aunt and uncle often despair at what my cousins and now my cousins dc consider "healthy" foods based on USA standards as they're not healthy by Uk standards and the portion sizes when eating out/takeaways are apparently insane!
So maybe this translates to the way the nursery op uses operates?
Certainly no nursery or even childminder or nanny I've ever known (I've worked in childcare) would consider muffins healthy or appropriate as a regular breakfast for little ones, it would also go against the nutrition guidelines here for childcare professionals.