Start by adding sliced yellow onions to your slow cooker and set it to high. Allow them to cook for about 30-40 minutes, stirring occasionally until they turn tender and a beautiful golden brown.

While the onions are caramelizing, season your chuck roast generously with salt, pepper, and thyme. Once the onions are ready, place the seasoned roast directly on top of them in the slow cooker.

Next, pour in the beef broth and Worcestershire sauce over the roast. For an extra layer of flavor, add a splash of balsamic vinegar if you wish.

Cover the slow cooker with its lid and set it to low. Let your Crock Pot French Onion Pot Roast cook for about 8 hours, or until the meat is fork-tender.

Once the cooking time is up, remove the roast and set it aside on a plate to rest. If the gravy needs thickening, whisk together cornstarch with a bit of cold water and add it to the slow cooker, stirring until the sauce thickens.

Slice the pot roast and serve it over mashed potatoes or alongside crusty bread, ladling generous amounts of onion gravy on top.