Serve this richly flavored compote over pancakes or waffles, ice cream, or cheesecake.
Combine in a medium saucepan:
Bring to a boil over medium-high, then reduce the heat and simmer until the berries release their juices and the mixture looks soupy, about 5 minutes. Stir together in a small bowl:
Stir the cornstarch mixture into the blueberries and simmer until the sauce thickens, about 1 minute. Let cool and keep refrigerated. Serve cold or warmed.