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You know those days where everything feels like a lot and the idea of cooking dinner makes you want to crawl into a blanket fort and order takeout? Yeah — this soup is for that day.
When I was a kid growing up in the Midwest, lentil soup was one of those cozy, cold-weather staples my mom made without even thinking. She didn’t have a recipe printed out. No Pinterest. Just a few pantry ingredients and a slow cooker that seemed to run from October through March.
This version? It’s ridiculously easy. Like, five ingredients and a slow cooker easy. But it still tastes like you tried, you know? It’s warm, filling, and weirdly comforting in the way only a bowl of homemade soup can be.
And the best part? It basically cooks itself. Which means you can get on with your day — laundry, Zoom calls, pretending you’ve cleaned the kitchen — while dinner does its thing.
Why You’ll Keep Coming Back to This Soup
Let’s be honest, we all need a few no-brainer meals in our back pocket. This one delivers:
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Only 5 ingredients — No “surprise” sixth thing. Just five.
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Great for picky eaters — Especially if you blend it. More on that below.
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Cheap but not sad — Tastes like comfort, costs like pocket change.
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Slow cooker = your new best friend — Dump it all in and walk away.
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Tastes even better tomorrow — It’s like leftovers that level up.
What’s In It (and What You Can Totally Wing)
No fancy stuff here. Just regular ingredients you probably already have hanging out in your pantry or fridge.
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1 cup raw lentils – Green or brown are great. Red will get soft and creamy, which is actually kind of lovely if that’s your thing.
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4 cups vegetable broth – Use whatever you’ve got. Even bouillon cubes and water work in a pinch.
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1 can (14.5 oz) diced tomatoes – Don’t drain ‘em. That juice = flavor gold.
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1 onion, chopped – Any kind. Yellow, white, red — whatever’s closest to sprouting.
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2 carrots, sliced – No need to peel unless you’re feeling extra. Frozen works too.
Salt and pepper at the end make it sing. Add a swirl of olive oil if you’re feeling fancy.
How to Make It (Honestly, It’s Hard to Mess Up)
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Rinse your lentils. Just give them a quick rinse in a colander to get rid of any weird dust or stray bits.
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Toss everything into the slow cooker. Lentils, carrots, onion, broth, tomatoes — juice and all. Stir if you want. Or not. No judgment.
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Cover and cook on low for 6–8 hours or high for 3–4.
When the lentils are soft and the carrots are tender, it’s done. That’s it. -
Taste and season. Salt and pepper go in after cooking so they don’t get lost.
Want it creamy? Use an immersion blender for a few seconds — or go full puree mode if you want it silky smooth.
Ways to Make It Yours (Because You Totally Will)
This soup is kinda like that plain white T-shirt you can dress up any way you want. Here are some tried-and-true tweaks:
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Add spice – Toss in a pinch of cumin, smoked paprika, or a dash of curry powder.
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Throw in greens – Spinach, kale, Swiss chard — just stir in a handful near the end.
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Bulk it up – Add some cooked sausage, leftover chicken, or even a can of white beans.
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Picky kid trick – Blend it up smooth and call it “orange soup.” Add shredded cheese on top if you’re really trying to win hearts.
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Top it off – A dollop of sour cream, some croutons, or a splash of lemon juice right before serving does wonders.
Let’s Talk Leftovers (AKA Tomorrow’s Win)
This soup is even better the next day. It thickens up and the flavors get deeper — kind of like letting a playlist grow on you.
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Fridge: Keeps 4–5 days easy.
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Freezer: Good for 2–3 months. Freeze in portions and you’ve got emergency meals ready.
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Reheat: Stove or microwave, just add a splash of broth or water if it got too thick.
Sometimes I spoon it over leftover rice or roasted potatoes. Zero regrets.
A Bowl of Soup, a Little Peace, and Maybe Some Bread
Here’s the thing — this soup isn’t flashy. It’s not going viral on TikTok. But it’s the kind of recipe you come back to. It holds you when your day’s been a mess. It feeds your people without breaking the bank. And maybe best of all? It asks very little of you.
So go ahead. Make it yours. Serve it with buttery cornbread, a chunk of crusty bread, or just your favorite spoon and a quiet moment.
And hey — if you try it, let me know how it turned out. Or what you added. Or whether your kids ate it without complaining (a true miracle). I’ll be over here, probably making another batch.
Stay cozy. Soup season’s just getting started.
Slow Cooker 5-Ingredient Lentil Soup
Ingredients
- 1 cup raw lentils rinsed
- 4 cups vegetable broth
- 1 can diced tomatoes 14.5 oz, with juice
- 1 onion chopped
- 2 carrots sliced
Instructions
- Place the rinsed lentils in the slow cooker.
- Add the chopped onion and sliced carrots.
- Pour in the vegetable broth and the can of diced tomatoes, including the juice.
- Stir everything together to combine.
- Cover and cook on low for 6–8 hours, or until the lentils are tender.
- Before serving, give the soup a good stir and season with salt and pepper to taste.
Notes
Nutrition