Step 1: Build the vegetable base - Add the diced celery, chopped carrots, sliced onion, and halved baby potatoes to the bottom of your slow cooker. Spread them out evenly so they cook at the same pace.
Step 2: Add the roast - Place the chuck roast directly on top of the vegetables. No need to brown it first unless you want to, this recipe works beautifully without that extra step.
Step 3: Mix the sauce - In a small bowl, whisk together the Catalina dressing and the dry onion soup mix until fully combined. This is where all that bold flavor starts.
Step 4: Pour it on - Pour the dressing mixture evenly over the roast, making sure some of it runs down over the vegetables too.
Step 5: Slow cook - Cover the slow cooker and cook on low for eight hours or on high for six hours. Low and steady gives you the most tender beef.
Step 6: Serve - Once done, the roast should be fork tender. You can slice it or shred it, then spoon the vegetables and sauce over the top. Serve hot and enjoy.