Preheat oven to 400˚F. Lay bacon slices on a baking sheet and cook for 15-20 minutes, until crispy.
Meanwhile, heat grill to medium-high. Season burgers with salt and pepper. Using your finger, make an indentation in the middle of each burger. This helps the patty stay flat and cook more evenly! For a medium-rare burger, grill for 3-4 minutes on each side.
Brush buns with oil and grill for 1-2 minutes, until slightly charred.Assemble burger with lettuce, patty, bacon, tomato, blue cheese and other bun.