Preheat your oven to 425°F. Toss a bunch of broccolini with olive oil, garlic powder, and a good pinch of salt. Spread it out on a baking sheet and roast until crispy and golden—about 15–20 minutes.
Bring a large pot of salted water to a boil and cook your pasta until al dente. Save about ½ cup of pasta water before draining.
While the pasta cooks, toast the California walnuts in a dry pan over medium heat until fragrant and lightly golden. Set aside.
In the same pan, melt the butter and let it brown until golden and nutty.
Add your cooked pasta directly into the browned butter. Stir in lemon zest, a squeeze of lemon juice, and a splash of the reserved pasta water. Toss until everything’s glossy and coated.
Plate the pasta and top with lots of grated parmesan, the toasted walnuts, chopped Italian parsley, and a crack of black pepper. Serve the crispy broccolini on the side!