Boil a large pot of salted water, add half the box of pasta + cook 10-12 min or until al dente, then drain + return to pot

Meanwhile, heat 1 tbsp oil in skillet over med-high; pat chicken dry, season with salt/pep + cook 4-6 min per side until fully cooked, no pinkness remains + internal temp is 165°; remove chicken + slice into bite-size pieces

Heat ½- 1 cup sauce + spinach in a pan over medium, 3-4 min until sauce is hot + spinach wilts; add chicken to sauce + warm 1-2 min

Toss pasta with sauce + divide to plates