Bring a pot of salted water to a boil and cook the brown rice pasta according to package directions until al dente.
Season the chicken breast with sea salt and black pepper on both sides.
Heat olive oil in a large skillet over medium-high heat and sear the chicken for 5-7 minutes per side until golden and cooked through.
Remove the chicken from the pan, let it rest for 2 minutes, then slice into thin strips.
In the same skillet, reduce heat to low and add the minced garlic, sautéing for 30 seconds until fragrant.
Whisk in the Greek yogurt, parmesan cheese, and 2 tablespoons of reserved pasta water to create a smooth sauce.
Stir in the fresh baby spinach until it just begins to wilt.
Add the cooked pasta and sliced chicken back into the skillet, tossing well to coat everything in the creamy sauce.
Garnish with fresh chopped parsley and serve immediately.