Housekeeping (1980), Hemingway Foundation/PEN Award for best first novel, nominated for the Pulitzer Prize for Fiction,
Gilead (2004), Pulitzer Prize for Fiction, National Book Critics Circle Award for Fiction, Ambassador Book Award,
Home (2008), Orange Prize for Fiction.
Marilynne Robinson's fiction output over thirty years may be small but it is certainly distinguished. I've had her books on my wishlist for ages and have yet to read them, though her "finely wrought" stories and "sensational descriptive prose" appeal greatly.
You may like to read the Paris Review interview with Marilynne Robinson (in which she talks most interestingly about science and New Atheism, anxiety, and puritanical hedonism, among other things), but have you read her fiction?