Preheat oven to 350 degrees. Line a baking sheet with foil and spray with non-stick spray
Melt buter in saute pan over medium heat. Cook onions until fragrant and brown, reduce heat to low and add garlic, cook for 2-3 minutes. Remove from heat.
In a large bowl combine ground beef, egg, bread crumbs, milk, Worcestershire sauce, thyme, and cooked onions, and garlic. Mix ingredients well.
Divide meat into 6 equal disks and wrap bacon around each disk.
In a clean bowl, combine ketchup, mustard and brown sugar. Spread over each loaf and top with crispy fried onions if desired.
Bake for 1h to 1hr and 15 minutes.
I always serve with mashed potatoes and roasted veggies! Enjoy