Rinse the brown basmati rice under cold water until the water runs clear to remove excess starch.
Dice the chicken breast into bite-sized 1-inch pieces and season evenly with sea salt, black pepper, and dried oregano.
Heat the extra virgin olive oil in a large skillet over medium-high heat until shimmering.
Add the chicken to the skillet and sear until golden brown on all sides, approximately 5-6 minutes, then remove the chicken and set aside.
In the same skillet, add the diced yellow onion and red bell pepper, sautéing for 3-4 minutes until the vegetables have softened.
Stir in the minced garlic and dry rice, toasting the grains for 1 minute until they become fragrant.
Pour in the chicken bone broth, using a wooden spoon to scrape the bottom of the pan to release any flavorful browned bits.
Bring the liquid to a boil, then reduce the heat to low, cover with a tight-fitting lid, and simmer for 35-40 minutes until the rice is tender.
Stir the cooked chicken and fresh baby spinach into the skillet, covering for 2 minutes until the spinach is wilted and the chicken is heated through.