Bring a large pot of salted water to a boil and cook the whole wheat linguine 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 until golden brown and cooked through.
Remove the chicken from the skillet, let it rest for five minutes, then slice it into thin strips.
In the same skillet, add the minced garlic and halved cherry tomatoes, sautéing for two minutes until the tomatoes begin to blister.
Drain the linguine, reserving a small splash of pasta water, and add the noodles to the skillet with the tomatoes.
Stir in the basil pesto, baby spinach, and sliced chicken, tossing everything together until the spinach is slightly wilted and the sauce is glossy.