Place the beef stew meat, sliced onions, beef broth, minced garlic, thyme, bay leaves, salt, and black pepper into the slow cooker.
Stir once to combine, then cover and cook on low for 8 hours until the beef is very tender.
When the stew is nearly done, arrange the baguette slices on a baking sheet and top each one evenly with the shredded Gruyère cheese.
Broil the toast points for 2 to 3 minutes until the cheese melts and turns golden.
Remove the bay leaves from the stew, then ladle it into bowls and serve with the Gruyère toast points on top or alongside.