Low-Heat Caramelized Onion & Mushroom Risotto

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · ·

A luxurious risotto where onions and mushrooms slowly caramelize on low heat, creating a deeply savory, creamy rice dish without a heavy sauce. This italian-inspired vegetarian ready in about 65 minutes pairs arborio rice, large, finely diced yellow onion, sliced cremini mushrooms for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 420 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.

★ 3.8 (12 ratings) Prep: 20 min Cook: 45 min Serves 4 Italian cuisine 420 cal/serving
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Ingredients

Instructions

  1. Step 1: In a large saucepan, melt 2 tbsp butter over low heat. Add the 1 large finely diced yellow onion and cook for 30 minutes, stirring every 5 minutes, until deeply golden and caramelized.
  2. Step 2: Add the 8 oz sliced cremini mushrooms and 2 minced garlic cloves to the onions, cooking for 8 minutes until mushrooms are tender and release their liquid.
  3. Step 3: Stir in the 1.5 cups arborio rice and cook for 2 minutes until rice is coated and slightly translucent.
  4. Step 4: Pour in the 1/2 cup white wine and simmer on low heat for 3 minutes until absorbed.
  5. Step 5: Add the warmed 4 cups chicken broth, one ladle at a time, stirring constantly after each addition until fully absorbed before adding more. Cook for 20 minutes total.
  6. Step 6: Stir in the 1/2 cup grated Parmesan cheese, 1 tsp chopped fresh thyme, 1/2 tsp salt, and 1/4 tsp black pepper. Cook for 2 more minutes until rice is creamy and tender, then remove from heat.

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Frequently asked questions

How long does Low-Heat Caramelized Onion & Mushroom Risotto take to make?

Total time is about 65 minutes (20 min prep + 45 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 Low-Heat Caramelized Onion & Mushroom Risotto?

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 arborio rice from drying out.

Can I substitute ingredients in Low-Heat Caramelized Onion & Mushroom Risotto?

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 Low-Heat Caramelized Onion & Mushroom Risotto 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.

What goes well with Low-Heat Caramelized Onion & Mushroom Risotto?

Italian vegetarian like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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