Marcona almonds—mostly imported from Spain—are smaller, rounder, softer, and sweeter than most almond varieties. They’re becoming more widely available—Costco carries them—but if you can’t find them, substitute toasted sliced almonds. You can substitute 1 pound pre-sliced cremini mushrooms for the shitakes and creminis. You can also substitute 0% Greek yogurt for the sour cream. It breaks slightly when you stir it into the green beans, but in the end it’s almost undetectable.