Bring a pot of salted water to a boil and cook the brown rice penne according to package directions until al dente.
While the pasta cooks, season the chicken breast evenly on both sides with sea salt, black pepper, and garlic powder.
Heat the extra virgin olive oil in a large skillet over medium-high heat.
Add the chicken to the skillet and sear for 5-7 minutes per side until golden brown and the internal temperature reaches 165 degrees Fahrenheit.
Remove the chicken from the pan, let it rest for 3 minutes, then slice it into bite-sized strips.
In the same skillet, add the sundried tomatoes and baby spinach, sautéing for 1-2 minutes until the spinach is just wilted.
Add the cooked pasta, sliced chicken, and basil pesto to the skillet, tossing everything together over low heat until well coated and warmed through.