Preheat your oven to 400°F (200°C).
Trim the ends of the broccolini and toss with olive oil, half the salt, and half the pepper on a rimmed baking sheet.
Roast the broccolini for 12-15 minutes until the edges are charred and the stalks are tender.
While the vegetables roast, cook the whole wheat pasta in boiling water until al dente; reserve 1 tablespoon of pasta water before draining.
Season the chicken breast evenly with garlic powder and the remaining salt and pepper.
Heat a non-stick skillet over medium-high heat and sear the chicken for 6-7 minutes per side until the internal temperature reaches 165°F.
Allow the chicken to rest for 3 minutes before slicing into thin strips.
In a large bowl, combine the cooked pasta, fresh pesto, and reserved pasta water, tossing until the noodles are evenly coated.
Assemble the bowl by topping the pasta with sliced chicken and roasted broccolini, finishing with a squeeze of lemon juice and a sprinkle of Parmesan cheese.