Slow Cooker French Dip Sandwiches

beef chuck roast (trimmed of excess fat (I've also used a sirloin steak for a leaner option))

low sodium beef broth (plus a little more if needed)

worcestershire sauce

extra virgin olive oil

large yellow onions (halved and thinly sliced)

garlic (minced)

bay leaf

salt/pepper

rolls (nothing too soft or it will fall apart once dipped)

slices cheese (provolone, swiss, havarti or monterey jack)