There’s a moment—usually around 3 p.m. on a slate-gray January Tuesday—when the fridge is almost bare, the wind is rattling the maple branches outside my kitchen window, and my body is screaming for something warm, comforting, and guilt-free. That’s the moment I started making this Slow Cooker Chicken and Celery Soup. It’s the recipe I lean on when I want the nostalgic flavor of my grandma’s chicken noodle but need to keep calories in check after a season of holiday cookies and champagne. The first time I tested it, I tossed a pound of celery into the crock-pot with nothing but a skeptical shrug. Seven hours later the house smelled like Thanksgiving and the soup was so savory I did a little victory dance right there in my slippers—no cream, no butter, no noodles, yet lusciously silky and deeply satisfying. Since then it’s become my quiet post-weekend reset, my “I’m teaching three yoga classes tomorrow and need something light but protein-packed” supper, and the dish I deliver to friends who’ve just brought babies home and need nourishment without heaviness. If you’re craving comfort that won’t weigh you down, pull out your slow cooker and let’s get started.

Why This Recipe Works

Dump-and-go convenience: Everything except the peas goes into the slow cooker at once—no browning, no extra pans.
Calorie-smart satisfaction: At just 165 calories per generous cup, you can pair it with a slice of crusty sourdough and still stay under 300 calories.
High-protein, low-fat: Two pounds of chicken breast delivers 38 g protein per serving without skin or dark meat.
Zero added fat: Flavor comes from herbs, aromatics, and the natural gelatin in celery—not oil or butter.
Freezer-friendly: Portion into mason jars and freeze up to three months for instant healthy lunches.
Flexible veggies: Clean-out-the-fridge friendly—swap in zucchini, green beans, or spinach without altering cook time.
Anti-bloat bonus: Celery is a natural diuretic, making this soup a tasty antidote to salty take-out weekends.

Ingredients You'll Need

Great soup starts at the grocery store. Here’s what to look for—and why each ingredient earns its place in the pot.

Chicken breast: Go for 2 lb (about 900 g) of boneless, skinless meat. Organic air-chilled chicken will give you the cleanest flavor and least shrinkage. Thighs work if you don’t mind the extra 40 calories and 2 g fat per serving; just trim visible fat.

Celery: One full bunch (about 8 medium ribs) plus the leaves. Look for pale-green, rigid stalks; floppy celery tastes vegetal instead of sweet. Save the leaves—they’re packed with chlorophyll and add bright garnish.

Onion & carrot: A medium yellow onion gives mellow sweetness, while two large carrots provide beta-carotene color. Dice small so they soften completely during the long simmer.

Garlic: Four cloves, smashed. Fresh garlic mellows beautifully in the slow cooker; jarred minced garlic can turn bitter.

Herbs: Dried thyme and rosemary hold up to extended heat. If you have fresh, double the quantity and add in the last 30 minutes.

Bay leaf & peppercorns: Whole spices infuse subtle warmth; fish them out before serving.

Low-sodium chicken broth: You’ll need 6 cups. Boxed is fine, but if you have homemade, use it—just season carefully. Vegetable broth keeps the soup vegetarian-friendly if you swap beans for chicken.

Frozen peas: Stirred in at the end for a pop of sweetness and color. No need to thaw.

Lemon juice: A tablespoon added just before serving wakes up every other flavor without extra salt.

Optional heat: A pinch of crushed red-pepper flakes gives gentle background warmth without noticeable calories.

How to Make Slow Cooker Chicken and Celery Soup for Low Calorie

Prep the aromatics Wash celery thoroughly—grit hides in the channel. Slice ribs ¼-inch thick on the bias for pretty crescents. Dice onion and carrot to ½-inch so they cook evenly. Smash garlic with the flat of a chef’s knife; remove paper skins.

Layer the slow cooker Add carrots and onion to the bottom—they take longest to soften. Nestle chicken breasts on top in a single layer. Scatter celery, garlic, thyme, rosemary, bay leaf, peppercorns, and optional red-pepper flakes. Pour broth over everything. The meat should be just submerged; add up to 1 cup water if your cooker runs hot.

Set it and forget it Cover and cook on LOW 6–7 hours or HIGH 3–3½ hours. Resist lifting the lid; each peek drops the temperature 10–15 °F and adds 15 minutes to cook time. The soup is ready when chicken shreds effortlessly and carrots yield to a fork.

Shred the chicken Transfer breasts to a plate; discard bay leaf. Use two forks to pull meat into bite-size shreds. Return meat to the pot and stir—it will soak up broth and stay juicy.

Brighten and sweeten Stir in frozen peas. Replace lid and let stand 5 minutes; the residual heat will cook peas to vibrant green without mush. Finish with lemon juice, taste, and adjust salt and pepper.

Serve smart Ladle into warm bowls. Garnish with reserved celery leaves, cracked black pepper, or a whisper of shaved Parmesan (adds only 22 calories per teaspoon). Pair with a side salad or a slice of sprouted-grain toast for a complete 300-calorie meal.

Expert Tips

Keep it clear

For a pristine broth, strain through cheesecloth before returning shredded chicken to the pot. Fat floats to the top and can be skimmed with a spoon after chilling.

Overnight flavor

Soup tastes even better the next day as celery releases natural sodium. Make it Sunday, portion into containers, and you’re set for a week of grab-and-go lunches.

Slow-cooker quirks

Older models run cooler. If chicken isn’t shreddable after the stated time, turn to HIGH for 30 minutes and check again.

Salt last

Broth reduces slightly during slow cooking. Season with salt only at the end to avoid over-salting.

Flash-cool trick

Divide hot soup into shallow containers so it cools from 140 °F to 70 °F within two hours, preventing bacteria growth.

Double duty

Turn leftovers into a quick white chili by adding a can of rinsed cannellini beans, a teaspoon of cumin, and a handful of baby spinach. Simmer 5 minutes and serve.

Variations to Try

Lemon-Turmeric Immunity Boost: Add 1 tsp ground turmeric and an extra lemon wedge. The earthy spice pairs beautifully with celery.
Asian-Inspired: Swap thyme for 1 Tbsp grated ginger, finish with a splash of low-sodium soy sauce and chopped scallions.
Creamy (Still Light): Purée 1 cup of the finished soup with ½ cup plain Greek yogurt and stir back into the pot for a faux-cream base that adds only 25 calories per serving.
Bean & Green: Skip chicken and add two cans of great Northern beans plus 3 cups chopped kale for a vegan version. Cook on LOW 4 hours.
Smoky Paprika: Stir ½ tsp smoked paprika into the raw aromatics for a campfire undertone that tricks your palate into thinking there’s bacon.

Storage Tips

Refrigerator: Cool completely, transfer to airtight containers, and refrigerate up to 5 days. Reheat single portions in the microwave 90 seconds on HIGH or on the stovetop over medium heat until steaming.

Freezer: Ladle cooled soup into pint-size freezer bags, squeeze out excess air, and freeze flat. Stack like books to save space. Thaw overnight in the fridge or submerge sealed bag in cold water for 30 minutes. Warm gently; peas may darken slightly but flavor remains fresh.

Make-ahead lunch jars: Divide soup among five 2-cup mason jars, add a wedge of lemon on top, seal, and refrigerate. Grab one each morning; it’ll be perfectly thawed by noon if you forgot to freeze it.