Bring a large pot of salted water to a boil and cook the spaghetti according to package directions until al dente.
Reserve 1/2 cup of the pasta cooking water, then drain the pasta in a colander.
While the pasta cooks, warm a large skillet over medium heat and cook the grilled pesto chicken and cherry tomatoes until the tomatoes are softened and heated through.
Add the cooked spaghetti to the skillet (or return to the pot) and pour in the cup of basil pesto and 1/2 cup reserved pasta water; toss over low heat until the pasta is evenly coated and sauce is loosened.
Slice the grilled pesto chicken breasts and arrange over the tossed spaghetti.
Finish with a pinch of freshly grated Parmesan and serve warm.
Equipment
Large Pot
Colander
Large Skillet
Tongs
Knife
Cutting Board
Notes
Homemade basil pesto is recommended but store-bought works fine.
Reserve some pasta water to adjust sauce consistency.
Cook pasta to al dente for best texture.
Slice chicken after resting briefly to retain juices.