Fettuccine with Zucchini and Onions

Light, comforting, and impossibly simple, this Fettuccine with Zucchini and Onions celebrates summer vegetables and pantry staples. Think tender ribbons of fettuccine tossed with sweet-savoury sliced onion and crisp-tender zucchini matchsticks, finished with butter and olive oil for a silky sauce. It’s the kind of pasta you can make any night of the week when you want something that feels special without a lot of fuss.

This version uses two zucchini, cut in half and sliced into matchsticks, and one small peeled and thinly sliced yellow onion. A little olive oil and unsalted butter carry the flavors, while a full pound of fettuccine brings this dish together in satisfying portions. The instructions below walk you through every step so the dish comes out balanced, bright, and perfectly textured.

Why you’ll love this recipe

• Fast: From pot to plate in about 25–30 minutes.
• Flexible: Add herbs, lemon, grated cheese, or toasted nuts to customize.
• Vegetable-forward: Zucchini is the star—light and fresh against rich pasta.
• Pantry-friendly: Simple ingredients that are likely already in your kitchen.

Ingredients

• 2 zucchini, cut in half and cut into matchsticks zucchini
• 1 yellow onion, 1 small peeled and thinly sliced yellow onion
• 1 tbsp olive oil, 1 tablespoon olive oil
• 2 tbsps unsalted butter, 2 tablespoons unsalted butter
• 1 pound pasta, 1 pound fettuccine pasta
• Salt and freshly ground black pepper, to taste
• Optional: freshly grated Parmesan or Pecorino, lemon zest, red pepper flakes, chopped fresh basil or parsley

Prep and cooking overview

To get great results, have all your ingredients ready before you start: zucchini cut into matchsticks, the onion peeled and thinly sliced, and a large pot of salted water brought to a boil for the fettuccine. The timing is important—cook the pasta until al dente and sauté the vegetables until just tender so they retain texture and flavor.

Step-by-step directions

1. Bring a large pot of water to a rolling boil and add a generous pinch of salt. This is the best way to season the pasta from the inside out.
2. Add 1 pound fettuccine pasta to the boiling water and cook according to the package instructions until al dente. Reserve about 1 cup of the cooking water before draining the pasta.
3. While the pasta cooks, prepare the vegetables: cut 2 zucchini in half lengthwise and slice each half into thin matchsticks. Peel 1 small yellow onion and thinly slice it into even pieces.
4. Heat a large skillet over medium heat and add 1 tablespoon olive oil. Once the oil shimmers, add the sliced yellow onion. Sauté the onion, stirring occasionally, for about 4–6 minutes until it becomes translucent and begins to soften.
5. Add the zucchini matchsticks to the skillet with the onion. Continue to cook, stirring, for 4–6 minutes more until the zucchini is tender-crisp and slightly golden in spots. Season the vegetables with salt and freshly ground black pepper to taste as they cook.
6. Reduce the heat to low and add 2 tablespoons unsalted butter to the skillet. Allow the butter to melt and toss it with the zucchini and onions so the vegetables are coated in a glossy, flavorful layer.
7. Add the drained fettuccine to the skillet with the vegetables. If the pan is too small, return the pasta to the pot and combine there. Pour in a splash of the reserved pasta cooking water (start with 1/4 cup) and toss everything together to create a light sauce that clings to the noodles. Add more reserved water, a tablespoon at a time, if you want a looser sauce.
8. Taste and adjust seasoning with additional salt and pepper as needed. If using, stir in a handful of freshly grated Parmesan or Pecorino, a pinch of red pepper flakes, or a little lemon zest to brighten the dish.
9. Serve the pasta hot, garnished with chopped fresh basil or parsley if you like. Offer more grated cheese at the table for passing around.

Tips for success

• Salt the pasta water: Properly salted water is the easiest way to boost flavor without extra effort.
• Don’t overcook the zucchini: Aim for tender-crisp so it holds shape and adds texture against the fettuccine.
• Reserve pasta water: The starchy water is an excellent emulsifier for turning butter and oil into a silky sauce that clings to the noodles.
• Customize freely: Add toasted pine nuts or slivered almonds for crunch, or stir in a spoonful of cream for a richer finish.
• Make it lemony: A squeeze of fresh lemon juice or a little zest added at the end brightens the whole plate.

Variations and serving ideas

• Cheesy: Fold in grated cheese like Parmesan, Pecorino, or a crumbly sheep’s milk variety.
• Herby: Finish with chopped basil, chives, or flat-leaf parsley for a fresh herbal note.
• Spicy: Add a pinch of red pepper flakes when the onions sauté for a gentle heat.
• Protein boost: Serve with a simple seared chicken breast, skillet-cooked shrimp, or white beans for added substance.
• One-pan shortcut: If you want fewer dishes, cook the pasta and quickly toss everything in the same large pot after draining.

Make-ahead and storage

Leftovers keep well for 2–3 days in an airtight container in the fridge. Reheat gently in a skillet over low heat with a splash of water or broth to loosen the sauce and refresh the texture. For best results, avoid the microwave when you can—gentle stovetop reheating preserves the zucchini’s texture and keeps the butter from separating.

Final notes

This Fettuccine with Zucchini and Onions is approachable weeknight food with enough flexibility to dress up for guests. The vegetables shine, the butter and olive oil create a silky coating, and the fettuccine makes every bite comforting. Because the recipe uses straightforward techniques and common ingredients, it’s an excellent base recipe to return to again and again—add fresh herbs, swap cheeses, or gently roast the zucchini for a deeper flavor when you want a variation.

Enjoy this bright, satisfying pasta on its own or paired with a simple green salad and a piece of crusty bread. It’s proof that a handful of honest ingredients, thoughtful technique, and proper seasoning are all you need to make an everyday meal feel special.

Fettuccine with Zucchini and Onions

A simple, comforting fettuccine tossed with sautéed zucchini and sweet onions.

Print Recipe Pin Recipe

Prep Time 10 minutes mins

Cook Time 30 minutes mins

Total Time 40 minutes mins

Servings: 4 servings

Ingredients Equipment Method Notes

Ingredients

  

• 2 zucchini halved and cut into matchsticks
• 1 yellow onion small, peeled and thinly sliced
• 1 tbsp olive oil 1 tablespoon
• 2 tbsp unsalted butter 2 tablespoons
• 1 lb fettuccine pasta 1 pound

Equipment

• Large Pot
• Large Skillet
• Colander
• Measuring Spoons
• Baking Sheet
• Aluminum Foil

Method

 

1. Bring a large pot of salted water to a boil and cook the fettuccine until al dente according to package directions.
2. While the pasta cooks, heat the olive oil and butter in a large skillet over medium heat.
3. Add the sliced onion to the skillet and sauté until translucent, about 3–5 minutes.
4. Add the zucchini matchsticks to the skillet and continue to cook until slightly tender, about 3 minutes; then remove the skillet from the heat.
5. Drain the pasta, reserving 1/2 cup of the cooking water.
6. Toss the drained pasta into the skillet with the onions and zucchini and add some reserved cooking water as needed to keep the pasta moist and lightly sauced.
7. Place a large sheet of aluminum foil on a baking sheet, transfer the pasta to the center, cover with another sheet of foil, and seal the edges tightly.
8. Bake in a hot oven for 15 to 20 minutes until heated through.
9. Carefully open the foil (steam will be hot) and transfer the pasta to a large serving plate.

Notes

• Reserve pasta water to adjust sauce consistency.
• Slice zucchini into matchsticks for even cooking.
• Use unsalted butter to control salt level.
• Be careful when opening hot foil to avoid steam burns.