01 -
Cut the beef chuck roast into 3-4 large pieces and pat dry. Lightly sprinkle a pinch of the onion soup mix over all sides of each piece.
02 -
Heat a cast iron skillet over medium-high heat and coat with vegetable oil. Sear roast pieces without moving for 2-3 minutes per side until browned and easily lifted from the pan.
03 -
Spray the crock pot interior with non-stick spray. Place the seared beef pieces in a single layer if possible. Evenly sprinkle the remaining onion soup mix and brown gravy mix over the beef, then pour in the red wine vinegar if using.
04 -
Cover and cook on low for 8 hours, avoiding opening the lid during cooking. Cook until the meat shreds easily with a fork.
05 -
Prepare mashed potatoes and garlic Texas toast as per package directions.
06 -
On each plate, place a slice of garlic Texas toast. Top with ½ cup mashed potatoes, then add ½ to 1 cup shredded beef. Drizzle with gravy from the crock pot and garnish with fresh minced parsley. Serve alongside steamed or roasted vegetables if desired.