Peel and dice the potato. Dice the beef, mushrooms, carrots, and onion into bite-sized pieces.
Add the beef stew meat, potatoes, mushrooms, carrots, onions, garlic, Worcestershire sauce, salt, tomato paste, dried thyme, black pepper, bay leaf, and beef broth into a 4 quart crockpot.
Stir to combine, cover the crockpot and cook on low for 7 hours.
Add the flour to a bowl then add about 1/2 cup of cooking liquid and whisk until smooth.
Stir the flour mixture into the stew and add the peas to the crock pot. Stir to combine.