Crockpot Vegetarian Three Bean Chili with Sweet Potatoes

When the onion softens in the skillet, the kitchen starts to smell like chili before the slow cooker is even loaded. I like that early step because it gives the…

By Julia • October 25, 2026 • Reading time: 9 min

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When the onion softens in the skillet, the kitchen starts to smell like chili before the slow cooker is even loaded. I like that early step because it gives the aromatics a little attention up front, then the crockpot takes over while the sweet potatoes and beans cook together into a hearty, spoonable chili.

This Crockpot Vegetarian Three Bean Chili with Sweet Potatoes makes six servings, with black, kidney, and pinto beans tucked into a tomato-rich base. The sweet potatoes bring a gentle sweetness that sits nicely alongside the cumin and chili powder, and the smoked paprika adds a warm, rounded note. It’s a comforting pot of food with enough substance to stand on its own, and the hands-on work is brief.

Why the Spices Taste Fuller After a Quick Skillet Start

It’s easy to think the slow cooker will do every bit of flavor-building, but dried spices benefit from a short turn in warm oil before they meet the tomatoes and broth. Chili powder, cumin, smoked paprika, and oregano each release more aroma when they hit the hot onion mixture. That brief contact also lets the tomato paste deepen, rather than leaving the spices to taste as if they were stirred in at the end.

This isn’t a long browning project. The onion gets time to soften, then the garlic and tomato paste cook briefly before the spices go in for just 30 seconds. The skillet should smell fragrant, not scorched. If the spice mixture catches or darkens too much, the finished chili can taste bitter, so keep it moving and transfer it to the slow cooker once that quick bloom is done. That small head start gives the long, gentle cook a more developed base without adding much hands-on time.

What the Beans, Sweet Potatoes, and Tomato Base Each Bring

• Sweet potatoes — They soften into tender, substantial bites and balance the savory tomato base. Choose firm potatoes without soft spots; peeling and cutting them into even cubes helps them cook at a similar pace.
• The three beans — Black, kidney, and pinto beans give the chili a mix of shapes and textures. Canned beans are convenient here, and ordinary store brands work well. Drain and rinse them so their canning liquid doesn’t carry into the chili; if you change the combination, stick with the listed bean varieties and the same total of three cans.
• Diced tomatoes and tomato sauce — The diced tomatoes leave little pieces throughout the chili, while tomato sauce creates a smooth, cohesive base. Use plain canned tomatoes and sauce; seasoned versions could shift the balance of the spices.
• Tomato paste — This concentrated tomato ingredient gives the onion mixture a deeper, more savory foundation. It’s not interchangeable with tomato sauce in the skillet, which is thinner and won’t cook down in the same quick step.
• Chili powder, cumin, smoked paprika, and oregano — Together they create the familiar chili character, with smoked paprika adding a distinct smoky note. Fresh, fragrant spices matter most here; if a jar smells faint when you open it, the chili will have less aroma.
• Onion, garlic, and olive oil — The onion makes the base sweet and savory, and garlic adds a sharper aromatic note. A standard yellow onion and everyday olive oil are fine; the onion should be diced and the garlic minced so both distribute through the pot.
• Vegetable broth — Low-sodium broth adds liquid without overpowering the tomatoes or seasoning. A gluten-free low-sodium vegetable broth works as a direct alternative when you need the finished chili to be gluten-free.

From Skillet Aromatics to Fork-Tender Sweet Potatoes

Soften the Onion Without Browning It

Heat the olive oil in a 10-inch skillet over medium heat, then add the diced onion. Cook for 5 to 7 minutes, stirring now and then, until the pieces have softened. You’re looking for translucent edges and a fragrant, gently sweet smell, not dark, crisp bits. If the onion starts to brown quickly, lower the heat so it has time to soften evenly.

Cook the Garlic, Tomato Paste, and Spices Briefly

Stir in the minced garlic and tomato paste and cook for 1 minute. Add the chili powder, cumin, smoked paprika, oregano, salt, and black pepper, then stir for 30 seconds. Keep the mixture moving across the pan so the spices warm evenly and the garlic doesn’t scorch. Once it smells aromatic, take the skillet off the heat and move on to the slow cooker.

Load the Slow Cooker and Combine

Transfer the onion mixture to a 6-quart slow cooker. Add the peeled, 1/2-inch-cubed sweet potatoes, drained and rinsed black beans, kidney beans, and pinto beans, along with the diced tomatoes, tomato sauce, and vegetable broth. Stir until the tomato mixture and seasonings are spread through the ingredients. The pot will look loose at this point; the vegetables and beans need that liquid for the long cook.

Cook Until the Sweet Potatoes Give Easily

Cover and cook on LOW for 7 to 8 hours or HIGH for 4 to 5 hours. The best doneness cue is a fork sliding into a sweet potato cube without resistance; a firm center means it needs more time. Slow cookers vary, so use that texture cue alongside the listed cooking window. Stir the chili well before serving so the beans, vegetables, and tomato base are evenly mixed.

Three Small Changes That Suit Different Kitchens

Questions That Come Up When the Slow Cooker Is Loaded

Crockpot Vegetarian Three Bean Chili with Sweet Potatoes

Crockpot vegetarian three bean chili cooks low and slow with sweet potatoes, tomatoes, and warming spices for a thick, hearty texture. The sweet potatoes turn tender while three kinds of beans make every bowl filling.

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Prep Time 15 minutes mins

Cook Time 8 hours hrs 8 minutes mins

Total Time 8 hours hrs 23 minutes mins

Servings: 6 servings

Course: Dinner

Cuisine: American

Calories: 360

Ingredients Equipment Method Notes

Ingredients

  

• 1 tbsp olive oil
• 1 yellow onion medium, diced
• 3 cloves garlic minced
• 2 tbsp tomato paste
• 2 tbsp chili powder
• 2 tsp ground cumin
• 1 tsp smoked paprika
• 1 tsp dried oregano
• 1 tsp salt
• 0.25 tsp black pepper
• 1.5 lb sweet potatoes peeled and cut into 1/2-inch cubes
• 1 can (15 oz) black beans drained and rinsed
• 1 can (15 oz) kidney beans drained and rinsed
• 1 can (15 oz) pinto beans drained and rinsed
• 1 can (14.5 oz) diced tomatoes
• 1 can (15 oz) tomato sauce
• 1 cup low-sodium vegetable broth

Equipment

• 1 10-inch skillet
• 1 6-quart slow cooker

Method

 

1. Heat the olive oil in a 10-inch skillet over medium heat, add the onion, and cook for 5 to 7 minutes until softened.
2. Stir in the garlic and tomato paste and cook for 1 minute.
3. Add the chili powder, cumin, smoked paprika, oregano, salt, and pepper and stir for 30 seconds.
4. Transfer the onion mixture to a 6-quart slow cooker; add the sweet potatoes, black beans, kidney beans, pinto beans, diced tomatoes, tomato sauce, and vegetable broth, then stir to combine.
5. Cover and cook on LOW for 7 to 8 hours or HIGH for 4 to 5 hours, until the sweet potatoes are tender when pierced with a fork.
6. Stir the chili well before serving.

Notes

For the best texture, cut the sweet potatoes into even 1/2-inch cubes. Refrigerate leftovers for up to 4 days; freeze for up to 3 months. For a gluten-free version, check that the broth and canned ingredients are labeled gluten-free.