Heat olive oil in a large skillet over medium-high heat. Add the onion and garlic and cook until soft and golden brown, approximately 4 to 5 minutes. Stir in the tomato paste and red pepper flakes and cook 1 minute. Stir in ½ cup of water, scraping up any browned bits. Transfer the contents of the skillet to a 6-quart slow cooker.
Add garbanzo beans, squash, chard stems (not the leaves), Parmesan rind, salt, pepper, and 7 cups water to the slow cooker. Stir, then cover and cook on low for 8 hours.
Just before serving, lift cooker lid and stir in the chard leaves and crumbled bacon bits; cover and continue cooking 10 more minutes. Season with more salt and pepper, if desired, and stir to break up the squash. Discard the Parmesan rind. Ladle the soup into bowls; top with the grated Parmesan cheese. Serve with bread and lemon wedges.
This Slow Cooker Squash Soup recipe is from the The Ultimate Cook'n Cookbook Cookbook. Download this Cookbook today.
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