Lightly coat the bottom and sides of a slow cooker with nonstick cooking spray.
Add the beef stew meat and baby potatoes to the slow cooker.
Sprinkle the onion soup mix, garlic powder, sea salt, and black pepper evenly over the beef and potatoes.
Add the minced fresh garlic and gently toss the ingredients so the seasonings are evenly distributed.
Cut the butter into smaller pieces and arrange them over the beef and potatoes. Pour the water or halal-certified beef broth around the ingredients.
Cover and cook on HIGH for 3–4 hours or LOW for 6–8 hours, until the beef is tender and the potatoes can easily be pierced with a fork.
For the best Slow Cooker Garlic Butter Beef Bites and Potatoes, add the trimmed green beans during the final 1–2 hours of cooking so they remain tender without becoming too soft.
Gently stir everything before serving. Taste and adjust the salt, pepper, or butter as desired.