
Bring a large pot of water to a boil and cook penne according to package directions; drain and return to pot.
Meanwhile, heat oil in a large skillet over medium heat. Add garlic and cook, stirring, until fragrant but not browned. Add roasted red peppers, spinach, salt and pepper; cook, stirring, until the spinach is just wilted, about 4 minutes.
Combine the vegetable mixture with the penne. Stir in feta and serve.