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Slow Cooker Sweet Potato & Spinach Stew with Garlic & Rosemary
A soul-warming, hands-off vegetarian stew that fills the house with the aroma of rosemary and roasted garlic while it quietly bubbles away in the slow cooker.
The Story Behind This Stew
I first threw this stew together on a frigid January Sunday when the wind was howling off Lake Michigan and I couldn't bear the thought of another grocery run. My fridge held a forgotten bag of sweet potatoes, a wilting box of spinach, and a sprig of rosemary I'd optimistically bought for some other recipe I'd never made. The slow cooker—my winter survival tool—sat on the counter like a trusted friend.
What emerged six hours later was nothing short of alchemical: the sweet potatoes had collapsed into velvety chunks, their natural sugars intensified by the low, slow heat. The spinach, added in the final 30 minutes, stayed vibrant while lending its mineral depth. But the real magic came from the garlic—an entire head, cloves peeled and tossed in whole—roasting gently in the broth until it mellowed into buttery, spreadable nuggets that melted on your tongue.
My husband, a self-declared "meat-and-potatoes guy," went back for thirds. My neighbor, dropping off borrowed books, followed her nose to my door and left with the recipe scrawled on a sticky note. Now, it's my most-requested dish for potlucks, the meal I deliver to new parents, and the stew that simmers away while we shovel snow or decorate the tree. It's vegetarian comfort food that doesn't announce itself as such—it just tastes like home.
Why You'll Love This Slow Cooker Sweet Potato & Spinach Stew
- Hands-off cooking: Dump everything in the slow cooker and walk away—no babysitting required.
- Budget-friendly: Uses humble ingredients that stretch to feed a crowd for under $10.
- Meal-prep hero: Tastes even better the next day; perfect for Sunday prep, Monday-Friday lunches.
- Nutrient powerhouse: One bowl delivers 200% daily vitamin A, 80% vitamin C, and 10g plant protein.
- Freezer-friendly: Portion into quart bags and freeze flat for instant healthy comfort food.
- Customizable: Swap greens, add beans, or stir in coconut milk—it's your culinary playground.
- Aromatherapy included: Your house will smell like a Tuscan farmhouse—no candle required.
Ingredient Breakdown
Every ingredient here pulls double duty, building layers of flavor while nourishing your body. Let's break down the cast of characters:
Sweet potatoes – Choose orange-fleshed varieties like Garnet or Jewel for their natural sweetness and creamy texture. They break down just enough to thicken the broth while maintaining some toothsome cubes. Pro tip: microwave them for 3 minutes before peeling—slips the skins right off.
Fresh rosemary – This woody herb is the backbone of the stew. One generous sprig infuses the entire pot with piney, lemon-pepper notes. Don't chop it; leave it whole for easy removal and to prevent bitter green flecks.
Garlic – An entire head, cloves peeled but left whole. They roast gently in the broth, transforming from sharp and pungent to caramelized and sweet. Mash a few cloves against the side of the bowl for instant garlic "butter" in every bite.
Fire-roasted tomatoes – These add subtle smokiness and umami depth. If you can't find them, regular diced tomatoes work, but add a pinch of smoked paprika for similar complexity.
Vegetable broth – Go low-sodium so you control the salt. For extra richness, stir in a teaspoon of white miso paste—it melts into the broth and adds incredible body.
Fresh spinach – Added in the final 30 minutes to preserve its vibrant color and delicate texture. Baby spinach needs no chopping; mature spinach benefits from a rough chop.
Time-Saving Prep
Peel and cube sweet potatoes the night before; store submerged in cold water with a squeeze of lemon to prevent browning.
Budget Tip
Buy spinach in bulk bags—it's cheaper than boxes and wilts down to nothing. Freeze any extras for smoothies.
Full Ingredient List
For the Stew
- 2 lbs (about 4 medium) sweet potatoes, peeled and ¾-inch cubes
- 1 large yellow onion, diced
- 1 head garlic, cloves peeled and left whole
- 2 cans (15 oz each) fire-roasted diced tomatoes
- 3 cups low-sodium vegetable broth
- 1 sprig fresh rosemary (about 4 inches)
- 1 tsp smoked paprika
- ½ tsp ground cumin
- ½ tsp black pepper
- 1 tsp kosher salt (plus more to taste)
- 5 oz fresh baby spinach (about 5 packed cups)
- 2 tbsp balsamic vinegar
- 1 tbsp honey (or maple syrup for vegan)
Optional Garnishes
- Toasted pumpkin seeds
- Crumbled goat cheese
- Crusty bread for dipping
- Drizzle of chili oil
- Fresh cracked pepper
Step-by-Step Instructions
Quick Overview: Add everything except spinach to slow cooker → Cook on low 6 hours → Stir in spinach → Let stand 10 minutes → Serve hot with crusty bread.
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Step 1: Prep Your Produce (5 minutes)
Scrub sweet potatoes under running water. Peel with a vegetable peeler, rotating as you go to remove all skin. Cut into ¾-inch cubes—bite-sized but not so small they dissolve. Dice the onion; no need for perfection here. Peel garlic by smashing each clove with the flat side of a chef's knife; skins slip right off. Keep cloves whole so they roast rather than disappear.
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Step 2: Layer Flavors in the Slow Cooker
Add sweet potatoes, onion, and garlic to the slow cooker insert. Pour in both cans of tomatoes (juice and all), then the vegetable broth. Nestle the rosemary sprig right in the center like a little tree. Sprinkle smoked paprika, cumin, pepper, and salt evenly over the top—this prevents spice pockets. Resist stirring; the heat will distribute everything as it cooks.
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Step 3: Low & Slow Magic
Cover and cook on LOW for 6 hours. Do not lift the lid; each peek releases steam and adds 15 minutes to the cook time. If you're home, give the insert a gentle swirl at hour 4 to redistribute, but it's not required. The sweet potatoes are done when you can mash one against the side with a spoon.
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Step 4: The Spinach Finale
Remove the rosemary sprig (it will have given up most of its leaves—totally normal). Pile in the spinach; it looks like too much but wilts dramatically. Cover and let stand 30 minutes on the warm setting, or 10 minutes if you're in a rush. The residual heat wilts the spinach while preserving its bright color.
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Step 5: Brighten & Balance
Stir in balsamic vinegar and honey. These final touches wake up all the flavors—acid from the vinegar balances the sweet potatoes, while honey rounds any sharp tomato edges. Taste and adjust salt; I usually add another ½ teaspoon at this stage. Ladle into warm bowls and let the steam fog your glasses.
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Step 6: Serve & Savor
Top each bowl with a scattering of toasted pumpkin seeds for crunch, a crumble of tangy goat cheese, and a crack of fresh pepper. Pass crusty bread for sopping up the rosemary-scented broth. Leftovers refrigerate beautifully and thicken overnight—thin with a splash of broth when reheating.
Expert Tips & Tricks
Make-Ahead Magic
Prep everything the night before; store the slow cooker insert (covered) in the fridge. In the morning, set it in the base and hit start—breakfast is made while you shower.
Broth Body
For a richer broth, whisk 1 tsp white miso paste into ¼ cup hot broth, then stir back into the stew. It adds incredible umami without tasting "miso-y."
Overnight Cooking
Need it ready when you wake up? Cook on LOW for 8 hours. Add spinach in the morning, let stand 10 minutes while you brew coffee.
Thickness Control
Too thin? Mash a cup of sweet potatoes against the side and stir back in. Too thick? Thin with broth or coconut milk for creaminess.
Spinach Swap
Out of spinach? Kale, chard, or even frozen spinach work. For kale, add 45 minutes before serving; for frozen, just stir in and heat through.
Protein Boost
Stir in a can of drained chickpeas or white beans during the last hour. They'll heat through and add staying power without changing the flavor.
Common Mistakes & Troubleshooting
Variations & Substitutions
Spicy Moroccan
Add 1 tsp harissa paste and ½ tsp cinnamon. Swap spinach for chopped kale, add a handful of golden raisins, and garnish with toasted almonds.
Creamy Coconut
Replace 1 cup broth with full-fat coconut milk. Add 1 tbsp grated ginger and swap rosemary for lemongrass. Finish with lime juice and cilantro.
Summer Garden
Use zucchini and yellow squash instead of sweet potatoes. Add corn kernels and fresh basil. Finish with a drizzle of pesto and cherry tomatoes.
Storage & Freezing
Refrigerator
Cool completely, then store in airtight containers up to 5 days. The flavors meld and intensify—day 3 is peak deliciousness.
Freezer
Portion into quart freezer bags, press flat to remove air, and freeze up to 3 months. Thaw overnight in fridge or microwave from frozen.
Pro Tip: Freeze individual portions in muffin tins. Once solid, pop out and store in a bag. Instant single-serve blocks that thaw quickly in a pot with a splash of broth.
Frequently Asked Questions
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Slow Cooker Sweet Potato & Spinach Stew
Ingredients
- 2 large sweet potatoes, peeled & cubed
- 4 cups baby spinach
- 1 can (14 oz) diced tomatoes
- 1 can (14 oz) chickpeas, drained
- 4 cloves garlic, minced
- 1 onion, diced
- 4 cups vegetable broth
- 2 tsp fresh rosemary, chopped
- 1 tsp smoked paprika
- 1 tsp ground cumin
- Salt and black pepper to taste
- 2 tbsp olive oil
Instructions
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1
Heat olive oil in a skillet over medium heat; sauté onion and garlic until fragrant, about 3 minutes.
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2
Transfer onion mixture to slow cooker. Add sweet potatoes, tomatoes, chickpeas, rosemary, paprika, cumin, broth, salt and pepper.
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3
Stir to combine, cover and cook on LOW for 6 hours (or HIGH for 3 hours) until sweet potatoes are tender.
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4
Turn slow cooker to WARM. Stir in spinach, cover and let wilt for 5 minutes.
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5
Taste and adjust seasoning. Serve hot with crusty bread.
Recipe Notes
For extra protein, add cubed tofu or shredded cooked chicken. Leftovers freeze well up to 3 months.
