Cut the chicken breast into bite-sized pieces and season evenly with sea salt, black pepper, and dried oregano.
Heat the olive oil in a medium non-stick skillet over medium-high heat.
Add the chicken to the skillet and sauté for 4-5 minutes until golden brown on all sides.
Add the minced garlic and dry orzo to the pan, stirring constantly for 1 minute to lightly toast the pasta.
Pour in the chicken broth and lemon juice, scraping the bottom of the pan to release any browned bits.
Bring the liquid to a gentle simmer, then cover the skillet and reduce heat to low.
Cook for 8-10 minutes, or until the orzo is tender and most of the liquid has been absorbed.
Remove the lid and stir in the baby spinach, lemon zest, and parmesan cheese until the spinach is wilted and the sauce is creamy.
Serve immediately while hot.