Brown the beef. Heat 2 tbsp of oil in a large skillet over medium-high heat. Sear the beef cubes on all sides until golden brown. Yes, it smells amazing. Yes, it’s worth it.
Layer your slow cooker. Toss in the onions, carrots, parsnips, and potatoes first. Then place the beef on top.
Add flavor. Sprinkle in garlic, thyme, rosemary, bay leaf, and a pinch of salt and pepper. Pour in the beef broth, diced tomatoes, and Worcestershire sauce. Give it a gentle stir—but not too much, or you’ll turn your carefully layered beauty into a mushy mess.
Set it and forget it. Cover and cook on low for 7–8 hours or high for 4–5 hours. Your house will smell like a cozy cabin in the mountains.
Thicken if desired. About 30 minutes before serving, mix 2 tbsp cornstarch with 2 tbsp cold water and stir into the stew. Let it cook uncovered for the last half hour to get a nice, thick consistency.
Taste and adjust. Check seasoning, remove the bay leaf, and get ready to bask in the glory of your creation.