So I see someone has taken Naomi Kanakia’s essay, “Contemporary Literary Novels Are Haunted by the Absence of Money”, to heart.
In fact, far from the contention that "Steinbecks" of the world no longer exist - they are prolific, and commercially successful, in a wide variety of Genres. Indeed, given Saul Bellow only published his last novel in the last 25 years, it seems somewhat callous to bifurcate the great from the good so chronologically.
Percival Everett immediately comes to mind - with Pulitzer Prize-winning James, a nuanced and insightful retelling of Huckleberry Finn, or 'I Am Not Sydney Poitier' which works almost as an homage to Steinbeck.
'The Nickel Boys' by Colson Whitehead I'd argue surpasses most of Steinbeck's more popular canon (Of Mice and Men, Cannery Row etc...). A magnificent novel in the very best of the american tradition.
'A Visit from the Goon Squad' by Jennifer Egan is probably tied for the best 21st Century Pulitzer winner with Jayne Anne Phillips' 'Night Watch' -both Steinbeck-esque in their charting of social mores in the face of an ever-changing culture rendered as the symbol and signifier drenched shadows of capitalism against the cave wall of society.
Looking at the Booker Prize since Paul Beatty, I'd also highlight 'Shuggie Bain' - Douglas Stuart's opus about growing up with an alcoholic mother in the working class Glasgow of the 1980s, or 'Prophet Song' - the requiem for a mother of four trying to preserve her family as a far-right totalitarian regime takes control of Ireland and suspends the Irish constitution.