Cook the bacon: In a skillet over medium heat, cook the bacon until crispy. Transfer to a paper towel-lined plate to drain. (This step adds extra flavor but can be skipped for a dump-and-go version.)
Add ingredients to crockpot: In a large slow cooker, combine chopped cabbage, carrots, celery, onion, garlic, diced tomatoes, and chicken broth. Stir everything together.
Add bacon: Reserve a little for garnish if you'd like, and stir the rest into the crockpot. Add bay leaf and season with salt and pepper.
Cook: Cover and cook on LOW for 6–7 hours or on HIGH for 3–4 hours, until vegetables are tender.
Finish: Discard bay leaf, taste and adjust seasoning as needed. Serve hot with reserved crispy bacon sprinkled on top.
Notes
You can prep the veggies the night before and store them in the fridge to save time in the morning. For a thicker broth, mash some of the cooked vegetables before serving.