Miso-Caramelized Onion and Mushroom Pasta

By AislePrompt Editorial · Published 2026-04-08 · Updated 2026-04-08

How this recipe was made — this recipe was drafted by AislePrompt's AI-assisted pipeline from technique templates and USDA-sourced nutrition data, and published by AislePrompt Editorial — see how AislePrompt recipes are developed and reviewed.

Creamy pasta tossed with a rich umami sauce made from caramelized onions, mushrooms, and white miso, finished with fresh thyme. This Italian-inspired pasta recipe, ready in about 50 minutes, pairs fettuccine, extra-virgin olive oil, yellow onions for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 580 calories and feeds 2, 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: 15 min Cook: 35 min Serves 2 Italian cuisine 580 cal/serving

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Ingredients

8 oz fettuccine
2 tbsp extra-virgin olive oil
2 medium, thinly sliced yellow onions
8 oz, sliced cremini mushrooms
1 tbsp white miso paste
1/4 cup dry white wine
1 tsp leaves, finely chopped fresh thyme
1/4 tsp salt

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Instructions

Step 1: Bring a large pot of salted water to a boil. Cook 8 oz fettuccine for 8-10 minutes until al dente, reserving 1 cup pasta water before draining.
Step 2: While pasta cooks, heat 2 tbsp olive oil in a large skillet over medium-low heat. Add 2 medium thinly sliced yellow onions and cook slowly for 20-25 minutes until deeply caramelized and golden, stirring occasionally.
Step 3: Add 8 oz sliced cremini mushrooms to the skillet and cook for 8-10 minutes until mushrooms release their liquid and are tender.
Step 4: Stir in 1 tbsp white miso paste, 1/4 cup dry white wine, and 1/4 tsp salt. Simmer for 3 minutes until wine evaporates and sauce thickens slightly.
Step 5: Add drained pasta to skillet along with 1/4 cup reserved pasta water. Toss vigorously for 1-2 minutes until sauce coats pasta evenly. Stir in 1 tsp chopped fresh thyme before serving.