One-Pot Creamy Mushroom Spinach Pasta

By AislePrompt Editorial · Published 2026-04-06 · Updated 2026-04-06

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 drafted and published.

A velvety, restaurant-style pasta dish made entirely in one pot with earthy mushrooms, fresh spinach, and a luxurious cream sauce—ready in 30 minutes. This Italian-inspired one-pot recipe, ready in about 30 minutes, pairs penne pasta, butter, onion for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 520 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: 20 min Serves 4 Italian cuisine 520 cal/serving

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Ingredients

8 oz penne pasta
2 tbsp butter
1 small, finely chopped (1/2 cup) onion
8 oz, sliced (2 cups) cremini mushrooms
3 cloves, minced garlic
1 cup heavy cream
1/2 cup, grated Parmesan cheese
2 cups fresh spinach
1/4 tsp nutmeg
1/2 cup reserved pasta water

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Instructions

Step 1: Bring a large pot of salted water to a rolling boil, add 8 oz penne pasta, and cook for 8-10 minutes until al dente; reserve 1/2 cup pasta water, then drain pasta.
Step 2: Melt 2 tbsp butter in a large skillet over medium heat, then add 1/2 cup finely chopped onion and cook for 3-4 minutes until translucent and fragrant.
Step 3: Add 2 cups sliced cremini mushrooms and 3 minced garlic cloves; cook for 5-6 minutes until mushrooms are golden brown and have released their liquid.
Step 4: Stir in 1 cup heavy cream, 1/2 cup grated Parmesan cheese, 1/4 tsp nutmeg, and 1/2 cup reserved pasta water; simmer for 2 minutes until sauce thickens slightly.
Step 5: Add drained 8 oz penne pasta and 2 cups fresh spinach to the skillet, tossing vigorously for 1-2 minutes until spinach wilts and pasta is coated in creamy sauce. Serve immediately.