Follow the steps in order for the best result.
Begin by preheating your grill to a medium-high heat, ensuring it's ready for those patties.
In a mixing bowl, thoroughly combine the ground beef, chopped onion, Tabasco sauce, honey, garlic salt, crushed red pepper flakes, and black pepper. Mix everything together until well incorporated.
Cut the blue cheese into approximately 1-ounce squares or similar sized portions for stuffing the burgers.
Divide the seasoned meat mixture into 6 equal portions. Form each portion into a patty, carefully encasing a piece of blue cheese in the center of each.
Grill the patties for about 8-10 minutes, or until they reach your desired level of doneness, ensuring the cheese is melty and the burgers are cooked through.
Toast your hamburger buns lightly on the grill or in a toaster. Grill the portabella mushrooms alongside the burgers until tender.
Place each cooked patty on a toasted bun and generously top with roasted red peppers and grilled portabella mushrooms.
Serve immediately and enjoy this flavor explosion!