There’s something almost magical about the way a handful of humble ingredients can come together to create a meal that feels like a warm hug. This Simple Mushroom Penne with Walnut Pesto is one of those dishes—rustic yet refined, comforting yet sophisticated, and ready in the time it takes to watch an episode of your favorite show.
I first fell in love with walnut pesto during a trip to Northern Italy, where a tiny trattoria tucked away in a cobblestone alley served it with thick ribbons of pappardelle. The chef, a nonna with flour-dusted hands, told me walnuts were what her family used when pine nuts were too dear. That resourcefulness stuck with me. Back home, I started playing with the idea, pairing it with meaty mushrooms and ridged penne to catch every last drop of that nutty, garlicky sauce. The result? A dish that’s become my go-to when I want something that tastes like it simmered all day but actually comes together in a flash.
Love Simple Mushroom Penne with Walnut Pesto? So do we! If you're into Pasta or curious about Chicken Thigh Recipes, you'll find plenty of inspiration below.
Why This Recipe Works
- 30 minutes, start to finish—because even on busy nights, you deserve a meal that doesn’t taste rushed.
- Pantry heroics—walnuts, pasta, and mushrooms are staples that shine here. No obscure ingredients.
- Meal-prep friendly—make a double batch of pesto and stash it in the fridge for future pasta emergencies.
- Endlessly adaptable—swap in whatever nuts, greens, or pasta you have on hand.
The Story Behind the Sauce
- Toasted walnuts—their deep, almost buttery flavor elevates the pesto beyond the usual pine nut version. Toasting eliminates tannins, which can make raw walnuts bitter.
- Golden mushrooms—sautéed in a single layer until caramelized, not steamed, for maximum umami depth.
- Al dente penne—those ridges aren’t just for show; they cradle the sauce in every bite. Undercook slightly, as the pasta finishes in the hot sauce.
Pesto hails from Liguria, where basil grows in sun-drenched abundance and pine nuts are the classic choice. But this recipe embraces the spirit of cucina povera—Italian peasant cooking that turns simple ingredients into something extraordinary. Walnuts, cheaper and just as delicious, bring an earthy richness that feels right at home.
Essential Ingredients & Tools
For the Walnut Pesto
- ½ cup (60g) walnuts (toast them—it’s non-negotiable for maximum flavor)
- 2 cups (50g) fresh basil (pack it in like you’re stuffing a suitcase)
- 2 garlic cloves (because pesto without garlic is like a hug without a squeeze)
- ¼ cup (25g) nutritional yeast or Parmesan (for that umami punch)
- ½ cup (120ml) extra virgin olive oil (the good stuff—this is its moment to shine)
- 1 tablespoon lemon juice (to brighten everything up)
- ¼ teaspoon salt (to tie it all together)
For the Mushroom Penne
- 12 oz (340g) penne (ridged, so the sauce has something to cling to)
- 8 oz (225g) cremini mushrooms (sliced—they’re the meaty backbone of this dish)
- 2 tablespoons olive oil (for sautéing those mushrooms to golden perfection)
- Salt and pepper (season as you go—trust your tastebuds)
Tools You’ll Need
- Large pot (for the pasta)
- Skillet (wide enough to sauté mushrooms in a single layer)
- Food processor or blender (or a mortar and pestle if you’re feeling old-school)
- Colander and tongs (the unsung heroes of pasta night)
Serves 4 | Prep: 15 mins | Cook: 15 mins | Total: 30 mins
How to Make Simple Mushroom Penne with Walnut Pesto
- Toast Those Walnuts
Heat a dry skillet over medium heat—no oil needed. Toss in the ½ cup (60g) walnuts and let them toast, shaking the pan occasionally, until they’re golden and smell like heaven (about 3–5 minutes). Let them cool slightly before blending—hot nuts can turn your pesto greasy. - Blitz the Pesto
In a food processor, pulse the toasted ½ cup (60g) walnuts, 2 cups (50g) fresh basil, 2 garlic cloves, ¼ cup (25g) nutritional yeast (or Parmesan), 1 tablespoon lemon juice, and ¼ teaspoon salt until everything’s finely chopped. With the motor running, drizzle in the ½ cup (120ml) extra virgin olive oil in a slow, steady stream. Stop as soon as it’s smooth—over-blending can turn your pesto into a sad, dull paste. - Cook the Pasta
Bring a big pot of salted water to a boil (it should taste like the sea). Add the 12 oz (340g) penne and cook it just shy of al dente—about a minute less than the package says. Reserve a cup of that starchy pasta water before draining. It’s liquid gold for saucing. - Sauté the Mushrooms
Heat 2 tablespoons olive oil in a skillet over medium-high heat. Add the 8 oz (225g) cremini mushrooms in a single layer—don’t crowd them, or they’ll steam instead of caramelize. Let them sit undisturbed for a couple of minutes until they develop a golden crust, then give them a stir and season with salt and pepper. - Bring It All Together
Return the drained pasta to the pot. Add the pesto and mushrooms, tossing gently with tongs. Splash in some of that reserved pasta water, a little at a time, until the sauce coats every noodle in a silky embrace. - Serve with Love
Plate it up, shower it with extra Parmesan or nutritional yeast, and finish with a drizzle of your best olive oil. This is the kind of dish that begs to be eaten immediately, preferably with a glass of wine and good company.
Pro Technique
- Mushroom Mastery
The key to perfect mushrooms? Patience. Don’t stir them right away—let them sit in the hot pan until they develop a caramelized crust. That’s where the flavor lives. If they release liquid, crank up the heat to evaporate it quickly. - Pesto Perfection
For the smoothest pesto, drizzle the oil in slowly while the processor runs. And if you want next-level creaminess, blend in a tablespoon of cold butter (or vegan butter) at the end.
Storage & Freshness Guide
Pesto
- Store any leftover pesto in a jar with a thin layer of olive oil on top to keep it bright green. It’ll last in the fridge for up to 5 days, or freeze it in ice cube trays for future pasta emergencies.
Mushrooms
- Cooked mushrooms keep for 3–4 days in the fridge. Reheat them in a dry skillet to bring back their texture—microwaving will make them soggy.
Leftover Pasta
- If you have leftovers (unlikely, but possible), reheat them gently in a skillet with a splash of water or broth. The microwave is not your friend here.
Ingredient Variations and Their Impact
- Pecans instead of walnuts—for a sweeter, richer pesto. Toast them with a pinch of smoked paprika for depth.
- Shiitake mushrooms—swap them in for an extra umami kick. Deglaze the pan with mirin for a sweet-savory glaze.
- Arugula-basil pesto—replace half the basil with peppery arugula for a bolder flavor. Add capers for brininess.
- Gluten-free pasta—brown rice or chickpea penne work beautifully. Toss with toasted gluten-free breadcrumbs for crunch.
Perfect Pairings
Complementary Dishes
- Arugula Salad with Lemon Vinaigrette: The peppery greens and citrus cut through the pesto’s richness. Toss with shaved fennel for extra crunch.
- Roasted Cherry Tomatoes: Their sweetness balances the earthy mushrooms. Roast at 400°F (200°C) until burst, then scatter over the pasta.
Drinks
- Pinot Grigio: This crisp white wine’s acidity cleanses the palate between bites of creamy pesto.
- Sparkling Water with Lime: For a non-alcoholic option, the bubbles and citrus refresh the palate.
Something Sweet
- Dark Chocolate Almond Clusters: The bittersweet chocolate echoes the walnuts’ depth. Serve with espresso for a grown-up finish.
- Lemon Sorbet: A tangy, light dessert that resets the palate after the hearty pasta.
FAQs
- Can I use other nuts?
Absolutely. Almonds, pecans, or even sunflower seeds work in a pinch. Adjust toasting times as needed. - How do I keep my pesto green?
Blend it quickly, store it with oil on top, and add a splash of lemon juice to help preserve the color. - Can I freeze pesto?
Yes! Freeze it in ice cube trays for easy portioning. Thaw overnight in the fridge.
Simple Mushroom Penne with Walnut Pesto: A Weeknight Wonder That Tastes Like a Slow Sunday
Whip up this Simple Mushroom Penne with Walnut Pesto for a quick, flavorful meal. Toasted walnuts, caramelized mushrooms, and silky pesto make it irresistible. Try it tonight!
Ingredients
For the Walnut Pesto
-
½ cup walnuts (60g)
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2 cups fresh basil (50g)
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2 garlic cloves
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¼ cup nutritional yeast or Parmesan (25g)
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½ cup extra virgin olive oil (120ml)
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1 tbsp lemon juice
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¼ tsp salt
For the Mushroom Penne
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12 oz penne (340g)
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8 oz cremini mushrooms (225g)
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2 tbsp olive oil
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Salt and pepper (to taste)
Instructions
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Toast ½ cup (60g) walnuts in a dry skillet for 3–5 minutes until golden. Cool slightly.01
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Blend ½ cup (60g) walnuts, 2 cups (50g) fresh basil, 2 garlic cloves, ¼ cup (25g) nutritional yeast, 1 tbsp lemon juice, and ¼ tsp salt in a food processor. Drizzle in ½ cup (120ml) extra virgin olive oil until smooth.02
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Cook 12 oz (340g) penne in salted boiling water until al dente. Reserve 1 cup pasta water, then drain.03
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Sauté 8 oz (225g) cremini mushrooms in 2 tbsp olive oil over medium-high heat until caramelized. Season with salt and pepper.04
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Toss pasta with pesto and mushrooms, adding pasta water as needed to loosen the sauce.05
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Serve immediately with extra Parmesan or nutritional yeast.06
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