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Step 1: Season the chuck roast generously with garlic salt and black pepper.
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Step 2: Heat a cast iron skillet over medium-high heat and add avocado oil. Sear the roast for about 3–4 minutes per side until browned.
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Step 3: Transfer the roast to the crockpot and add the sliced mushrooms and diced onion.
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Step 4: Pour in the cream of mushroom soup, beef broth, and Worcestershire sauce.
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Step 5: Season with garlic powder, onion powder, and Dano's seasoning.
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Step 6: Mix everything together around the roast, cover, and cook on high for 5 hours until the beef is tender.
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Step 7: Shred the beef directly in the crockpot using two forks.
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Step 8: Add the cooked egg noodles and sour cream, then mix everything together until fully combined and creamy.
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Step 9: Let it sit for a few minutes to thicken, then serve hot.