Filo has much fewer calories and much less volume than pastry or bread. You don't need much to make a dish, and can leave out or minimise the butter or olive oil between layers.
I would eat it, as it gives yummy crunch and holds together a spinach and cheese pie, which is pretty nutritious especially as it also usually has egg and would freeze well so you can cook in bulk. Also, I love the muffin pan idea.
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