Heat olive oil in a skillet over medium-high heat. Add beef bites and sear until browned on all sides, about 2-3 minutes per side. Work in batches if needed to avoid overcrowding the pan.

Transfer seared beef to slow cooker. Add halved baby potatoes around the beef, creating an even layer.

In a bowl, combine melted butter, minced garlic, onion powder, smoked paprika, dried thyme, dried rosemary, salt, and pepper. Whisk until well combined.

Pour butter and garlic mixture over beef and potatoes, ensuring everything is evenly coated. Toss gently with a spoon if needed.

Pour beef broth into slow cooker to keep everything moist and develop rich flavors.

Cover and cook on low for 6-8 hours or on high for 3-4 hours, until beef is fork-tender and potatoes are soft. Avoid lifting the lid during cooking.

Serve hot directly from the slow cooker, garnished with fresh parsley if desired.