Although any blue cheese is delicious here look for one that is sliceable or crumbly not gooey.

8 slices of sourdough bread
sweet onion jam
6oz blue cheese; sliced or crumbled.
6 slices cooked Canadian Bacon
unsalted butter for pan.

8 slices of sourdough bread 6 oz blue cheese; sliced or crumbled. 6 slices cooked Canadian Bacon

Preheat oven to 300 degrees.
Spread 4 slices of bread with a generous helping of onion jam.
Top 4 slices only with blue cheese, a few slices of bacon.
Carefully join the slices together to make 4 sandwiches.
Melt the butter on a griddle or heavy skillet over medium heat.
Add sandwiches & cook until golden brown on each side; about 3 minutes on each side.
Transfer to baking sheet & bake for 5 minutes or just until cheese is melted.