This article has some good suggestions about making mini quiches - which pan (s) to use, baking times, ratio of dough to filling, etc. https://www.thekitchn.com/mini-quiche-268052
Basically, until they are done. They will take longer to bake than your mini quiches, so add 5 minutes to the original being time. Tap the tops, and if they are soggy rather than springy, add 3 or 4 minutes until they are springy. If they are crusty, they are overdone.
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https://www.thekitchn.com/mini-quiche-268052