1. In a large skillet heat oil over medium high heat.
2. Add garlic, sauté for 1 minute, then add chicken and cook for 7 to 8 minutes on each side.
3. When chicken is close to being cooked through (no longer pink inside), add spinach and pesto and sauté all together for 3 to 4 minutes.
4. In a large pot of salted boiling water, cook pasta for 8 to 10 minutes or until al dente.
5. Rinse under cold water and drain.
6. Add chicken/spinach mixture to pasta.