Thyme-Infused Potato and Onion Soup

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A simple, velvety soup where potatoes and onions meld into a comforting bowl with aromatic thyme. This American-inspired soup recipe (vegetarian), ready in about 40 minutes, pairs butter, onion, garlic for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 150 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 10 min Cook: 30 min Serves 4 American cuisine 150 cal/serving
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Ingredients

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Instructions

  1. Step 1: Melt 3 tbsp butter in a large pot over medium heat. Add 2 diced onions and cook for 5-7 minutes until softened and translucent, stirring occasionally.
  2. Step 2: Stir in 3 minced garlic cloves and cook for 1 minute until fragrant.
  3. Step 3: Add 4 diced potatoes and 4 cups vegetable broth, then stir in 1 tsp dried thyme. Bring to a simmer and cook for 20 minutes until potatoes are tender.
  4. Step 4: Use an immersion blender to puree the soup until smooth (or transfer to a regular blender in batches).
  5. Step 5: Return to pot if using regular blender, stir in 1/4 cup chopped fresh parsley, and season with salt and black pepper to taste.

Frequently asked questions

How long does Thyme-Infused Potato and Onion Soup take to make?

Total time is about 40 minutes (10 min prep + 30 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Thyme-Infused Potato and Onion Soup?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep butter from drying out.

Can I substitute ingredients in Thyme-Infused Potato and Onion Soup?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Thyme-Infused Potato and Onion Soup for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

Is Thyme-Infused Potato and Onion Soup vegetarian?

Yes — this recipe is tagged vegetarian based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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