Heat skillet to medium-high heat. Sprinkle bacon with black pepper on all sides. Add bacon to the skillet and cook until crisp. Transfer to a plate for later.
Mix blackened seasoning together in a small bowl. Form three burger patties with the ground beef and press down to about a ½" thickness. Sprinkle patties with seasoning on both sides.
Heat your grill to medium heat. Add burger to the grill and cook for about 4 minutes. Flip and cook for another 4 minutes. Sprinkle half the blue cheese on your burgers and close lid to let cheese melt for a minute.
Toast buns on the grill for about a minute cut side down.
Remove patties and buns from the grill and assemble your burger.
Spread mayonnaise on your buns, top with lettuce, onion, tomato, burger patty, bacon, remaining blue cheese and top bun. Enjoy!