Preheat oven to 400ยบ F. Line a rimmed sheet pan with aluminum foil.
Zest one of the lemons, then halve and juice it. Put the juice and the zest in a large Ziplock bag. Slice the second lemon into thin rounds.
Drop the chicken thighs, potatoes, chopped oregano, olive oil, lemon slices, and salt into the bag. Shake it all up so everything is thoroughly and evenly coated with salty, juicy goodness. Dump contents of bag onto the sheet pan.
Roast in the oven for 30-40 minutes, or until the chicken skin is crispy and the potatoes are nice and soft on the inside. Enjoy with a squeeze of lemon, a sprinkling of parsley, and/or a crumble of fresh feta.