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Why This Recipe Works
- Set-and-forget convenience: Ten minutes of morning prep equals dinner at six.
- Budget-friendly powerhouse: Lentils and chicken thighs cost pennies, yet deliver restaurant-level flavor.
- 45 g protein per serving: Keeps you full and fuels post-workout recovery.
- One-pot cleanup: Everything cooks in the slow cooker—no extra pans.
- Freezer hero: Doubles beautifully; freeze half for a ready-made meal.
- Spinach without the slime: Added at the end, it stays vibrant and tender.
Ingredients You'll Need
Great soup starts with great building blocks. Here’s what to grab—and why each ingredient matters.
Chicken thighs – 2 lb (900 g) boneless, skinless
Dark meat stays succulent after hours of simmering. If you only have breasts, swap them in but reduce the cooking time by 30 minutes so they don’t dry out. Organic, air-chilled thighs have better texture and flavor than conventionally raised.
Brown or green lentils – 1 ½ cups (285 g)
These varieties hold their shape, unlike red lentils which dissolve into mush. Rinse and pick out any stones. Lentils are naturally high in plant protein, folate, and iron, and they thicken the broth as they cook.
Fresh spinach – 5 oz (140 g)
Baby spinach wilts in seconds and adds vitamin K, vitamin A, and a pop of color. If you only have frozen, thaw and squeeze it dry first; stir in during the last 15 minutes.
Carrots – 2 medium, diced small
They add subtle sweetness and beta-carotene. Peel if the skins are bitter; otherwise, a good scrub is enough.
Celery – 2 stalks, diced small
The savory backbone of any mirepoix. Save the leaves and sprinkle them on top for garnish.
Yellow onion – 1 large, diced small
Sweeter than white onion, it melts into the broth. If you’re out, shallots work too.
Garlic – 4 cloves, minced
Fresh garlic beats powder every time. Smash cloves with the flat of a knife for easy peeling.
Low-sodium chicken broth – 5 cups (1.2 L)
Using low-sodium lets you control salt. If you have homemade stock, gold star—you’ll need 4 cups because it’s usually more concentrated.
Crushed tomatoes – 14 oz (400 g) can
Just tomatoes, no added basil or garlic. Fire-roasted adds a smoky note if you like.
Olive oil – 1 Tbsp
For sautéing the aromatics. Avocado oil works in a pinch.
Ground cumin – 1 tsp
Earthy warmth that pairs beautifully with lentils.
Smoked paprika – 1 tsp
Gives depth without heat. Regular paprika is fine, but you’ll miss the subtle campfire nuance.
Dried oregano – ½ tsp
Mediterranean flair. Rub it between your palms to wake up the oils.
Bay leaf – 1
Don’t skip it; bay leaf perfumes the entire pot. Remove before serving.
Kosher salt & freshly ground black pepper
Add in layers—some at the beginning, adjust at the end. I start with 1 tsp salt and ½ tsp pepper.
Optional brightness: a squeeze of lemon or a splash of apple-cider vinegar stirred in right before serving. Acid lifts all the savory notes.
How to Make High Protein Slow Cooker Chicken and Lentil Soup with Spinach
Sauté the aromatics (optional but worth it)
Set a medium skillet over medium heat. Add olive oil, onion, carrot, and celery. Cook 5 minutes until the onion turns translucent. Stir in garlic, cumin, paprika, and oregano; cook 60 seconds until fragrant. Transfer everything to the slow cooker. This layer of flavor only adds three minutes of active time but gives the finished soup a richer, more complex base.
Layer the lentils and broth
Rinse lentils under cold water until it runs clear; drain. Add to slow cooker. Pour in broth and crushed tomatoes. Stir to combine. Nestle the bay leaf on top. Keeping lentils submerged prevents them from staying crunchy.
Add chicken thighs whole
Season both sides of the thighs with 1 tsp salt and ½ tsp pepper. Lay them on top of the liquid; do not submerge. This braising method keeps the meat incredibly juicy and makes removal for shredding a breeze.
Set it and live your life
Cover and cook on LOW 7–8 hours or HIGH 4 hours. Resist peeking; every lift of the lid adds 15 minutes to the timer. The soup is ready when lentils are tender and chicken shreds easily.
Shred the chicken
Use tongs to transfer thighs to a plate. Discard the bay leaf. Two forks will pull the meat apart in 30 seconds; return shredded chicken to the pot. If you like chunkier soup, shred only half.
Wilt in the spinach
Switch the slow cooker to HIGH. Stir in spinach, cover, and cook 3–4 minutes until bright green and just wilted. This preserves color, texture, and nutrients.
Season to perfection
Taste and add more salt, pepper, or a squeeze of lemon. Broths vary wildly in sodium; start conservative and build. A final crack of fresh black pepper adds aromatic top notes.
Serve and garnish
Ladle into warm bowls. Top with celery leaves, a drizzle of good olive oil, or a dollop of Greek yogurt. Crusty whole-grain bread is non-negotiable for sopping up every last drop.
Expert Tips
Overnight soak trick
If you have a sensitive digestive system, soak lentils in salted water overnight. Drain and proceed; the soup will cook 30 minutes faster and be extra gentle on your gut.
Thicken or thin
For a thicker stew, use an immersion blender for 3 quick pulses. Prefer brothy? Add an extra cup of hot stock at the end.
Overnight flavor boost
Make the soup a day ahead; the flavors marry overnight. Store in the removable crock, cool completely, refrigerate, then reheat on WARM the next evening.
Chicken temp check
If you’re nervous about doneness, use an instant-read thermometer; thighs should register 175 °F / 79 °C for optimal shred.
Deglaze the skillet
After sautéing, splash ¼ cup broth into the hot pan and scrape up the browned bits; pour every drop into the slow cooker for bonus umami.
Buy lentils in bulk
A 2-pound bag costs the same as two cans of beans and makes eight batches. Store in an airtight jar with a bay leaf to deter pantry moths.
Variations to Try
- Moroccan twist: Swap cumin for 1 tsp each ground coriander and cinnamon; add ½ cup diced dried apricots and a handful of chopped cilantro.
- Extra greens: Stir in 2 cups chopped kale or Swiss chard with the spinach; they stand up to heat without wilting into nothingness.
- Spicy kick: Add ½ tsp cayenne or a minced chipotle in adobo with the tomatoes.
- Vegetarian pivot: Omit chicken, use vegetable broth, and add two cans of rinsed chickpeas plus an extra cup of lentils. Cook time remains the same.
- Creamy version: Stir in ½ cup light coconut milk or evaporated skim milk after shredding chicken for a creamy, dairy-free twist.
- Grain boost: Add ½ cup rinsed quinoa or farro during step 2 for even more protein and chew.
Storage Tips
Refrigerate: Cool soup completely, transfer to airtight containers, and refrigerate up to 4 days. The flavors deepen, so day-two bowls are legendary.
Freeze: Portion into freezer-safe zip bags, lay flat to freeze (saves space), and store up to 3 months. Thaw overnight in the fridge and reheat gently on the stove or in the microwave.
Make-ahead packs: Chop all vegetables and chicken the night before; store separately in the fridge. In the morning, dump everything into the crock and go.
Reheat: Warm on the stove over medium-low, stirring occasionally. Add a splash of broth or water because lentils continue to absorb liquid as they sit.
Frequently Asked Questions
High Protein Slow Cooker Chicken and Lentil Soup with Spinach
Ingredients
Instructions
- Sauté aromatics: Heat olive oil in a skillet over medium. Cook onion, carrot, and celery 5 min. Add garlic, cumin, paprika, and oregano; cook 1 min. Transfer to slow cooker.
- Build the base: Add lentils, broth, tomatoes, and bay leaf. Stir.
- Add chicken: Season thighs with 1 tsp salt and ½ tsp pepper; place on top.
- Slow cook: Cover and cook LOW 7–8 hr or HIGH 4 hr.
- Shred: Remove bay leaf and chicken; shred meat and return to pot.
- Finish: Stir in spinach, cover 3 min until wilted. Adjust salt and add lemon. Serve hot.
Recipe Notes
Soup thickens as it stands; thin with broth when reheating. Freeze portions flat in zip bags for up to 3 months.
