Spread a generous layer of blueberry jam on one side of each slice of sourdough bread.

Top the jam with slices of brie cheese.

Place the other slice of bread, jam side down, to form a sandwich.

Butter the outer sides of the sandwich.

Heat a pan over medium-low heat.

Add the sandwich to the pan and cook until the bread is golden brown and crispy.

Flip the sandwich and cook the other side until golden and the cheese is melted.