Place the diced bacon in a skillet over medium heat and cook until crisp. Remove the bacon with a slotted spoon and set it aside, leaving the fat in the pan.
Add the beef pieces to the same skillet and brown on all sides. Transfer the beef to the slow cooker.
Add the sliced onions and minced garlic to the skillet and cook for 3 minutes until the onions begin to soften. Scrape everything into the slow cooker.
Add the cubed potatoes, beef broth, thyme, salt, pepper, and Worcestershire sauce to the slow cooker. Stir to combine.
Cover and cook on low for 7 to 8 hours until the beef is tender and the potatoes are soft.
Stir the cooked bacon back into the stew just before serving.