Generously season the chuck roast with the salt and pepper on all sides. Heat the oil in a large skillet over medium-high heat and sear the roast on all sides, about 3 minutes on each side, until they are golden brown. Transfer the browned beef to your slow cooker.
4 lbs chuck roast, kosher salt and black pepper, 3 tablespoon vegetable oil
In the same skillet, sauté the onions, carrots, and celery with a hearty pinch of salt until softened, about 5-7 minutes. Add the thyme and garlic and let them cook until the garlic is fragrant, about 2 minutes.
1 large yellow onion, 2 large carrots, 3-4 garlic cloves, 1 teaspoon thyme
Stir the flour into the skillet, coating all the vegetables with the flour and cooking out the raw flour for a minute.
¼ cup all purpose flour
Whisk in 1 cup of beef broth, all the Worcestershire sauce, and smoked paprika, making a gravy. Pour everything over the beef in the slow cooker.
4 cups beef broth or stock, 1 tablespoon worcestershire sauce, 1 teaspoon smoked paprika
Add the cremini mushrooms and the rest of the beef broth. Stir everything together. Cover with the lid and cook on low for 8-10 hours or on high for 4-6 hours, until the beef is tender and easily shreddable.
8 oz cremini mushrooms, 4 cups beef broth or stock
Once the beef is tender, stir in the sour cream until the sauce is creamy and smooth. Taste and adjust the seasoning with salt and pepper if needed.
1 cup sour cream
Serve over egg noodles, mashed potatoes, or rice, and garnish with fresh parsley.
fresh parsley