Season meat with kosher salt and pepper on both sides.
Heat olive oil in large pan over medium high heat. Sear meat for 5-6 minutes per side until golden brown. Remove and place directly in heated slow cooker.
Deglaze the pan with stock and scrape all the stick on bits. Add flour if you prefer (this is optional)
In a small mixing bowl or measuring cup, mix together balsamic, Dijon, brown sugar, and thyme.
Add onions, carrots, and potatoes on top of the meat in the slow cooker. Top with balsamic mixture and stock from the pan.
Cook on low 8-10 hours.
Shred meat and remove fat. Mix and then serve with parsley as garnish.