Bring a pot of salted water to a boil and cook the whole wheat penne according to package directions until al dente.
While the pasta cooks, season the chicken breast with sea salt and black pepper on both sides.
Heat the extra virgin olive oil in a large skillet over medium-high heat and sear the chicken for 5-6 minutes per side until golden and cooked through.
Remove the chicken from the skillet, let it rest for 2 minutes, then slice it into thin, bite-sized strips.
In the same skillet, reduce the heat to medium and add the minced garlic, sautéing for 30 seconds until fragrant.
Add the fresh lemon juice and lemon zest to the skillet, using a wooden spoon to scrape up any flavorful browned bits from the chicken.
Toss in the cooked pasta, sliced chicken, and baby spinach, stirring for 1 minute until the spinach is just wilted.
Garnish with fresh chopped parsley and serve immediately.