Prep the Roast: Heat 2 tablespoons of olive oil in a large skillet over medium-high heat. Season the chuck roast with salt and black pepper on all sides.

Sear the Meat: Add the seasoned chuck roast to the skillet and sear for 4-5 minutes on each side until browned.

Combine in Cooker: Transfer the seared chuck roast to your slow cooker. Add sliced onion, minced garlic, beef broth, chili powder, cumin, and optional spices.

Slow Cook: Cover and set the slow cooker to cook on low for 7-8 hours or high for 4-5 hours.

Shred the Beef: Remove the roast from the slow cooker and shred the beef into bite-sized pieces, then return to the cooker.

Finish with Lime: Stir in the juice from 1-2 limes to enhance the flavor.

Prepare Tacos: Warm your tortillas and fill each with a portion of the shredded beef, then customize with toppings.