Chicken Pesto Spaghetti

Comforting, bright, and impossibly simple: this Chicken Pesto Spaghetti is the kind of weeknight dinner that makes you feel like you’ve spent hours in the kitchen when in reality it comes together in under 30 minutes. Combining tender grilled pesto chicken, juicy cherry tomatoes, and a silky pesto-coated spaghetti, this dish delivers vibrant basil flavor and satisfying protein in every twirl of pasta. If you love easy dinners with tons of flavor and minimal fuss, this recipe will become a fast favorite.

Why you’ll love this recipe

This Chicken Pesto Spaghetti is a one-pan-feel, multitextured meal that balances freshness with richness. The basil pesto brings herbaceous depth, the cherry tomatoes add juicy pops, and the grilled chicken provides hearty, savory bites. Using reserved pasta water creates an emulsified sauce that clings to every strand, so you don’t end up with a clumpy bowl or dry pasta. Plus, you can use homemade or store-bought pesto depending on how much time you have—both work beautifully.

Ingredients

• ▢ 14 ounces spaghetti dry weight, or pasta of choice
• ▢ 1/2 cup reserved pasta water
• ▢ 4 grilled pesto chicken breasts use this recipe
• ▢ 17 ounces cherry tomatoes
• ▢ 1 cup homemade basil pesto or store bought pesto
• ▢ 1 pinch parmesan cheese freshly grated, to serve

Notes on ingredients and substitutions

Spaghetti is used here for a classic texture and presentation, but any long pasta such as linguine or fettuccine will work. If you prefer short shapes, penne or fusilli will hold the pesto nicely too. The 4 grilled pesto chicken breasts referenced here should be prepared using a preferred grilled chicken method that pairs with the pesto; slice them before tossing with pasta so each forkful gets a generous piece. Cherry tomatoes add a sweet, juicy contrast; if you can’t find 17 ounces exactly, 1 pint plus a few extra will be perfectly fine.

For the pesto, homemade yields the best brightness and an herb-forward flavor. Store-bought pesto is a wonderful time-saver and will still produce excellent results. The reserved pasta water is essential—its starches help create a silky, cohesive sauce. Finish with a pinch of freshly grated parmesan for nutty, salty depth.

Equipment

• Large pot for boiling pasta
• Large skillet or sauté pan
• Tongs or pasta fork
• Cutting board and sharp knife
• Measuring cups

Prep & timing

Active time: 15–20 minutes. Total time: 20–30 minutes (depending on whether chicken is already grilled). For the quickest weeknight version, grill the chicken earlier in the day or use pre-grilled breasts and keep them refrigerated until ready to assemble.

Step-by-step instructions

Below are clear, ordered steps that follow the ingredient list exactly and ensure the smoothest execution. Read through once before you start so everything flows as you cook.

1. Bring a large pot of salted water to a rolling boil. Use plenty of water so the spaghetti cooks evenly and won’t stick together.
2. Add 14 ounces spaghetti (or pasta of choice) to the boiling water and cook according to package directions until just al dente. Timing will vary by pasta brand, but start checking a minute or two before the shortest suggested time.
3. Before draining any pasta, reserve 1/2 cup of the starchy cooking water. Use a heatproof measuring cup or small bowl to scoop out the water; this starchy liquid will help emulsify the pesto into a glossy sauce.
4. Drain the pasta well, but do not rinse it. Keep the drained spaghetti in the colander while you prepare the rest of the dish so it stays hot and ready to finish in the pan.
5. While the pasta is cooking, halve or leave whole the 17 ounces cherry tomatoes depending on your texture preference. Halved tomatoes will release a bit more juice into the sauce, while whole tomatoes provide more bite.
6. Heat a large skillet over medium heat. Add the cherry tomatoes and warm them until they begin to blister and soften, about 3–5 minutes. You want them warmed through and slightly broken down so they contribute flavor and a little sauce to the pasta.
7. Slice the 4 grilled pesto chicken breasts into strips or bite-sized pieces. If your chicken is hot from grilling, add it to the skillet with the tomatoes briefly to rewarm. If it’s cold, warm it gently so it doesn’t dry out.
8. Add the drained spaghetti to the skillet with the tomatoes and chicken. Toss gently to combine so the pasta picks up the tomato juices and the warm chicken.
9. Stir in 1 cup of homemade basil pesto (or store bought pesto) and pour in the reserved 1/2 cup pasta water. Toss continuously using tongs or a pasta fork. The goal is to create a glossy sauce that evenly coats the spaghetti; the pasta water helps the pesto loosen and emulsify.
10. Adjust the texture and seasoning as needed. If the sauce looks too thick, add a splash more reserved pasta water (a tablespoon at a time) until you reach a silky consistency. Taste and add salt or pepper if desired—keep in mind that pesto and parmesan contribute salt, so season lightly.
11. Once the spaghetti, chicken, and tomatoes are evenly coated and warmed through, remove the skillet from heat. Let the dish rest for 1–2 minutes so the flavors meld.
12. Serve immediately, finishing each plate with a pinch of freshly grated parmesan cheese. The cheese adds a bright, savory finish to the rich pesto and juicy tomatoes.

Troubleshooting & tips

• Too-thick sauce: Add more reserved pasta water a tablespoon at a time until you reach the right consistency.
• Chicken too dry: Slice the chicken and gently fold it into the warm sauce to moisten it again. Avoid high heat which can overcook the chicken further.
• Pesto balance: If the pesto is strong, thin it slightly with extra pasta water or a splash of olive oil. If it feels mild, add an extra spoonful of pesto for more herbaceous punch.
• Make-ahead: You can grill the pesto chicken up to 2 days ahead and store it chilled. Rewarm gently before adding to the pasta so it stays juicy.

Make it your own: variations

• Veggie boost: Stir in a couple of handfuls of baby spinach or arugula at the end until wilted for extra greens.
• Nuts & crunch: Sprinkle toasted pine nuts or chopped walnuts on top for a satisfying crunch and nutty depth.
• Lemony brightness: A squeeze of fresh lemon juice just before serving can lift the pesto and brighten the whole dish.
• Cheesy twist: Swap parmesan for grated pecorino or add a dollop of ricotta on top for creaminess.

Storage & reheating

Store leftovers in an airtight container in the refrigerator for up to 3 days. When reheating, add a splash of water or broth to loosen the sauce and warm gently in a skillet over low heat to prevent the pesto from losing its freshness. You can also reheat a portion in the microwave, stirring halfway through and adding a little water to maintain saucy texture.

Serving suggestions

This Chicken Pesto Spaghetti shines with simple sides. A crisp green salad with lemon vinaigrette, crusty bread for sopping up sauce, or roasted veggies make perfect companions. For a lighter meal, pair with a simple cucumber and tomato salad. For entertaining, set out extra grated parmesan and flaky sea salt so guests can finish their plates as they like.

Why the technique matters

Reserving pasta water and tossing the pasta with the sauce in the pan is more than a chef trick—it’s the secret to a restaurant-style finish. The starchy water binds oil-based sauces like pesto to the pasta, creating a silky coating rather than a loose, separated mixture. Warming the chicken only briefly keeps it tender, and letting the tomatoes blister adds concentrated sweetness without making the dish heavy.

Final thoughts

This Chicken Pesto Spaghetti is a dependable dinner that’s elegant enough for guests and easy enough for a busy weeknight. Its layered flavors—herb-packed pesto, sweet tomatoes, and savory grilled chicken—come together with minimal effort and maximum satisfaction. Give it a try with your favorite pesto, and don’t be afraid to tweak the add-ins to suit what’s in your pantry.

Complete recipe

Ingredients

• ▢ 14 ounces spaghetti dry weight, or pasta of choice
• ▢ 1/2 cup reserved pasta water
• ▢ 4 grilled pesto chicken breasts use this recipe
• ▢ 17 ounces cherry tomatoes
• ▢ 1 cup homemade basil pesto or store bought pesto
• ▢ 1 pinch parmesan cheese freshly grated, to serve

Directions

1. Bring a large pot of salted water to a boil, then add 14 ounces of spaghetti (or pasta of choice). Cook according to package directions until al dente.
2. Before draining, reserve 1/2 cup of the hot pasta water. Drain the pasta and set aside in the colander so it stays hot.
3. While the pasta cooks, prepare the tomatoes by halving them if you prefer, or leave them whole for more bite.
4. Heat a large skillet over medium heat and add the 17 ounces of cherry tomatoes. Cook until they begin to blister and soften, about 3–5 minutes.
5. Slice the 4 grilled pesto chicken breasts into strips or bite-sized pieces. Add the sliced chicken to the skillet with the tomatoes to warm through if needed.
6. Add the drained spaghetti to the skillet with the tomatoes and chicken, tossing gently to combine.
7. Stir in 1 cup of basil pesto and pour in the reserved 1/2 cup pasta water. Toss continuously until the pesto loosens and forms a silky sauce that coats the spaghetti evenly. Add additional reserved pasta water, a tablespoon at a time, if the sauce looks too thick.
8. Taste and adjust seasoning if desired, then remove from heat and let rest for 1–2 minutes so flavors meld.
9. Serve immediately, finishing each portion with a pinch of freshly grated parmesan cheese.

Enjoy this Chicken Pesto Spaghetti with a crisp salad or crusty bread for a meal that feels special with minimal effort. It’s dinner simplicity at its very best—bright, saucy, and satisfying.