Preheat oven to 375°F (190°C).
Arrange pepper halves cut side up in baking dish and bake 10 minutes to soften.
In a skillet over medium heat, cook chopped bacon until crispy. Remove and set aside.
In the same skillet, sauté diced onion and chopped mushrooms until softened.
Add minced garlic and cook for 30 seconds.
Add ground beef, salt, pepper, smoked paprika, and Worcestershire sauce. Cook until beef is browned.
Stir in BBQ sauce and cooked bacon.
Remove peppers from oven and fill each generously with the cheeseburger mixture.
Top each filled pepper with shredded cheese.
Return to oven and bake 15–20 minutes until peppers are tender and cheese is bubbly.
Garnish with parsley or green onions and drizzle with extra BBQ sauce if desired.
Serve hot with fries, salad, or roasted potatoes.