Prolific comfort food purveyors Micah Camden and Katie Poppe’s doughnut shop “for grown-ups” is a true, Portland-style sugar high. The Little Big Burger duo deftly mash up the city’s artisan-ingredient obsession with fried sweets. Five years in, with locations in nearly every quadrant of the city (not to mention outposts in LA and Tokyo) their clever brioche-dough offerings, from herby-tart blueberry bourbon basil to Valrhona chocolate crunch, threaten to dethrone Voodoo Doughnut as the city’s king dough pusher altogether.