Cooking Slow Cooker French Onion Meatloaf is a straightforward process when you follow these easy steps:

1. Prepare the Onions: If using fresh onions, slice them thinly and caramelize them in a skillet over medium heat until golden. This typically takes about 10-15 minutes.
2. Combine Ingredients: In a large bowl, mix the ground beef, caramelized onions, breadcrumbs, milk, egg, Worcestershire sauce, garlic powder, onion powder, thyme, salt, and pepper. Combine until just mixed; do not overwork the meat.
3. Shape the Meatloaf: Form the meat mixture into a loaf shape that fits well in your slow cooker.
4. Add to Slow Cooker: Place the meatloaf into the slow cooker. You can line the crock with parchment paper for easy removal later.
5. Top with Cheese: Sprinkle the shredded Swiss cheese on top of the meatloaf.
6. Cook the Meatloaf: Cover the slow cooker and cook on low for 6-8 hours or on high for 3-4 hours. The meatloaf is done when it reaches an internal temperature of 160°F (70°C).
7. Let it Rest: Once cooked, remove the meatloaf from the slow cooker and let it rest for about 10 minutes before slicing. This ensures the juices redistribute for a moist finish.
8. Serve: Transfer the meatloaf to a serving dish and garnish with freshly chopped parsley if desired.

Following these steps will ensure your Slow Cooker French Onion Meatloaf turns out beautifully each time.