Add sliced onions and bell peppers to the bottom of a 1.5 or 2-quart slow cooker.
In a small bowl, mix together oregano, paprika, cumin, cinnamon, turmeric, salt, and black pepper.
Pat the chuck roast dry with paper towels and rub the seasoning mix all over the beef.
Heat oil in a 10-inch skillet over medium heat. Sear the roast for about 2 minutes per side until browned. Transfer to a plate.
Cut two small 1-inch slits in the top of the roast. Use your fingers to widen the slits slightly and insert whole garlic cloves into the openings.
Place the seared roast on top of the onions and peppers.
In a small bowl, whisk together beef broth and tomato paste. Pour over the roast.
Pour in the diced tomatoes and scatter the olives on top.
Cover and cook on low for 8 hours or high for 4 to 5 hours, until the meat is tender.
Remove the roast, shred with a fork, and return it to the slow cooker. Stir and cook for 10 more minutes.Pro Tip: Taste before serving, some beef broths are saltier than others. Adjust the seasoning if needed.Enjoy as-is for a low-carb meal, or serve over rice for a more filling option.
Notes
Sear Properly: Heat the skillet before adding the beef. Sear until each side develops a deep, brown crust for the best flavor.
Insert Garlic Evenly: Space the garlic cloves throughout the roast so the flavor spreads evenly as it cooks.
Use the Right Slow Cooker: A 1.5 or 2-quart slow cooker works best for this recipe, ensuring even cooking and proper moisture levels.
Layer Vegetables First: Add onions and peppers to the bottom of the slow cooker to create a flavorful base that enhances the beef as it cooks.