Creating Slow Cooker Meatball Soup can be straightforward if you follow these simple steps:

1. Make Meatballs: In a mixing bowl, combine ground beef, breadcrumbs, Parmesan cheese, egg, minced garlic, Italian seasoning, salt, and pepper. Mix until just combined, then shape into small meatballs, about 1 inch in diameter.

2. Prepare Vegetables: Dice the onion, carrots, and celery into small pieces.

3. Add Ingredients to Slow Cooker: Place the meatballs at the bottom of the slow cooker. Top with diced onion, carrots, celery, diced tomatoes, and broth. Add green beans and frozen peas last.

4. Season Soup: Add bay leaf and stir gently to combine all ingredients without breaking the meatballs.

5. Cook: Cover and cook on low for 6-8 hours or on high for 3-4 hours, until vegetables are tender and meatballs are cooked through.

6. Serve: When ready to serve, remove the bay leaf and taste the soup for seasoning. Adjust salt and pepper if necessary.

7. Garnish: If desired, sprinkle fresh parsley on top for a touch of color and added flavor.