Instant Pot Lemon Pepper Orzo with Chicken Thighs

chicken thighs, bone-in and skin-on

olive oil

unsalted butter

onion, chopped

garlic cloves, minced

chicken broth (low sodium)

uncooked orzo pasta

large lemon, juice and zest *(see first note)

black pepper, freshly cracked

salt

(heaping) cups baby spinach

feta cheese, crumbled, plus more for topping