In a large bowl, combine ground beef, breadcrumbs, egg, garlic powder, onion powder, salt, and pepper.
Shape the mixture into 1-inch meatballs and set them aside.
In a slow cooker, add beef broth, carrots, potatoes, peas, thyme, and bay leaf; stir to combine.
Carefully add the meatballs into the crockpot; do not stir.
Cover and cook on low for 6-8 hours or high for 3-4 hours, until meatballs are cooked through and vegetables are tender.
Prior to serving, remove the bay leaf and give the stew a gentle stir.
Serve hot, garnished with fresh herbs if desired.