Prepare the Meatloaf Mixture: Preheat oven to 375°F (190°C). In a large bowl, mix ground beef, ground pork, breadcrumbs, onion, garlic, mushrooms, bacon, Swiss cheese, egg, milk, Worcestershire sauce, salt, pepper, thyme, and paprika until well combined.

Shape and Bake: Form the mixture into a loaf and place it in a greased loaf pan or on a lined baking sheet. In a small bowl, mix ketchup, brown sugar, and Dijon mustard, then spread it over the top of the meatloaf.

Bake: Bake for 50-60 minutes, until the internal temperature reaches 160°F (71°C). Let rest for 10 minutes before slicing.

Serve: Slice and serve warm with mashed potatoes or roasted vegetables.