The best replacement for quiche is frittata.

The best alternatives to quiche are rated as following:
★★★★★  frittata
★★  souffle
★  flan
★  strata
★  tart
★  casserole
★  torte
★  quiches
★  omelet
  quiche lorraine
  pie
  keesh
  custard
  quiche

Your alternative for quiche is not listed? Suggest!
Speaking about quiche, one probably shouldn't forget about crust recipes.

Other search terms related to quiche and their ratings are:
★★★★★ crust recipes
You have in mind a companion for quiche and it is not yet here? Propose!



Google Trends

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quiche
frittata
souffle