01 - Bring a large pot of generously salted water to a rolling boil. Add the mafaldine and cook according to package directions. When 5 minutes of cooking time remain, add the broccoli florets to the pot. Continue cooking until the pasta is al dente and the broccoli is tender-crisp. Reserve ⅓ cup of the starchy pasta water before draining.
02 - While the pasta cooks, heat the olive oil in a large skillet over medium heat. Add the minced garlic and sauté for about 1 minute, just until fragrant, taking care not to let it brown.
03 - Pour the heavy cream into the skillet and bring to a gentle simmer. Stir in the lemon zest, lemon juice, Parmesan cheese, salt, and pepper. Let the sauce simmer briefly until the cheese melts and the mixture is smooth.
04 - Add the drained pasta and broccoli to the skillet. Toss everything together thoroughly, adding reserved pasta water a splash at a time to reach your desired sauce consistency. Taste and adjust the seasoning as needed.
05 - Serve immediately in warm bowls, garnished with fresh basil leaves, an extra sprinkle of Parmesan, and additional lemon zest if desired.