n a medium saucepan, combine blueberries, sugar, and lemon juice. Cook over medium heat until the berries release their juices and start to simmer, about 5–7 minutes.
In a mixing bowl, whisk together flour, baking powder, salt, and sugar. Cut in the butter until the mixture resembles coarse crumbs. Stir in milk to form a soft dough.
Drop spoonfuls of the dough over the simmering blueberries. Cover with a lid and cook gently for 10–15 minutes, until the dumplings are cooked through. Do not lift the lid during cooking.
Serve warm, spooning blueberries and dumplings into bowls. Optional: top with vanilla ice cream or whipped cream