Heat 1 tbsp of olive oil over a large pot over medium high heat.
Take a paper towel and pat down your meat. Season all around with salt and pepper.
Add meat to the pot and brown it on both sides, about 5 min per side.
Once your meat is done, transfer it to the slow cooker.
Add your onion to the pot and sauté for about 3-4 minutes or until translucent. Add in your garlic and cook for another minute.
Once your onion mixture is done, transfer it to the slow cooker.
Add in your beef broth, rosemary, thyme, Worcestershire and tomato sauce to the slow cooker.
Arrange your carrots and potatoes on top of the beef. Cook on low for 8 hours.
Once it's done cooking, remove any fat that has floated to the top. Shred your beef and enjoy!