Step 1

Preheat the oven to 425 degrees F.

Step 2

For the blueberries: Place the blueberries in a large bowl and sprinkle in the sugar and lemon juice. Add the flour and stir to combine.

Step 3

For the dough: In a separate bowl, combine the flour, sugar, baking powder and salt. Stir it around, then add the cold butter and use a pastry blender to cut the butter into the dry ingredients.

Step 4

Whisk together the milk and egg in a small bowl, then drizzle it into the flour-butter mixture and stir until the dough just comes together. It should be lumpy and clumpy!

Step 5

Pour the blueberries into a 9-by-13-inch baking dish and dot them with the butter, then tear off pinches of the dough and dot them all over the top. Sprinkle the top with extra sugar.

Step 6

Cover lightly with foil and bake for 20 minutes, then remove the foil and bake until lightly browned, about 25 more minutes. Serve warm or at room temperature with a big scoop of vanilla ice cream.