Creating amazing Slow Cooker Beef Tacos is a breeze if you follow these simple steps:

1. Prepare the Beef: Trim any excess fat from the beef chuck roast and cut it into large chunks.
2. Sear the Beef: In a skillet over medium-high heat, add olive oil. Sear the beef chunks on all sides until browned. This step adds extra flavor but is optional.
3. Add Aromatics: Place the diced onion and minced garlic at the bottom of the slow cooker.
4. Season: Sprinkle chili powder, ground cumin, smoked paprika, dried oregano, salt, and pepper over the onion and garlic.
5. Add Beef: Place the seared beef on top of the seasonings and onion mixture.
6. Combine Liquids: Pour the tomatoes (with their juices) and beef broth into the slow cooker over the beef.
7. Cook: Cover and cook on low for 6-8 hours or high for 3-4 hours until the meat is tender and easily shredded with a fork.
8. Shred Beef: Once cooked, remove the beef from the slow cooker and shred it using two forks. Return it to the slow cooker and stir to combine with the juices.
9. Serve: Prepare your taco shells and fill them with the shredded beef and desired toppings.

Follow these steps to create irresistible Slow Cooker Beef Tacos full of flavor!