Step 1: Sear the Roast - Heat a large skillet over medium-high heat and add a tablespoon of vegetable oil. Sear the chuck roast on each side for 4-5 minutes until browned.

Step 2: Prepare the Slow Cooker - Combine honey, chipotle pepper, chipotle sauce, garlic powder, onion powder, cumin, salt, and pepper in slow cooker. Mix until smooth, then add seared roast.

Step 3: Slow Cook the Beef - Cover slow cooker and cook on low for 8-9 hours until fork-tender.

Step 4: Shred the Beef - Remove beef, shred with forks, return to cooker, and add lime juice.

Step 5: Pickle the Onions - Thinly slice red onion and combine vinegar, sugar, salt, and red pepper flakes; boil and pour over onions in a jar.

Step 6: Make the Creamy Avocado Sauce - Blend avocado, water, olive oil, cilantro, lime juice, garlic, and salt until smooth.

Step 7: Assemble Your Tacos - Warm tortillas, fill with beef, top with pickled onions and avocado sauce, and serve immediately.