Absolutely. I recommend still doing the first 10-15 minutes of onion caramelization in your pan on the stovetop. Then transfer them to the slow cooker with an extra drizzle of oil/butter and cook on LOW for 8-10 hours (overnight). Then add the remaining ingredients and cook for 6-8 hours on LOW or 2-4 hours on HIGH. Prepare the cheesy topped bread separately or serve in the bowls, then top and broil. Enjoy the crockpot French onion soup!