Optional: Heat the olive oil in a skillet over medium heat. Add the onion, celery, and half the salt. Sauté until translucent and fragrant, about 4-5 minutes. Add the garlic and sauté for another 1-2 minutes. Remove from the heat.
Add the onion, celery, garlic, carrots, chickpeas, rosemary, thyme, salt, black pepper, red pepper flakes (if using), and bay leaves to the crockpot.
Pour in the broth and mix together and cook on high for 4 hours or low for 6-8 hours.
30 minutes before the end of cooking, add the dried pasta and cook on low for another 15-30 minutes. The time will depend on your crockpot and brand of pasta. Start with 15 minutes and check the pasta. Continue cooking in 5 minute increments until done.
Add the lemon juice and mix together. Adjust salt and black pepper as needed.
Garnish with fresh parsley, and enjoy!
Notes
Storage instructions: Leftover soup will keep for up to 5 days in an airtight container in the refrigerator. Over time, the pasta will absorb a significant amount of liquid, so add additional broth when reheating. Or, cook the pasta separately and add to the broth right before reheating (this is ideal for meal prep).
Freezing instructions:
Before cooking - Add all ingredients except broth, rotini, lemon juice, and parsley to a gallon-sized ziplock bag. Seal and squish together to combine the ingredients. Label and freeze for up to 6 months (download my free labels here!). When ready to eat, dump bag contents into 6 qt slow cooker and add broth. Cook as usual.
After cooking - If you'd like to make soup broth cubes, make the soup without pasta and freeze for up to 6 months using 1-cup or 2-cup Souper Cube trays (use code HOMECOOKEDROOTS10 for 10% off). When ready to eat, reheat on stovetop or in microwave and add cooked pasta before serving.
Serving suggestions: You can't go wrong with a hearty slice of Garlic Bread or Naan for soaking up the broth.
Nutrition facts are an estimate and can change depending on the pasta and broth used.