Place the sliced almonds in a dry skillet over medium heat and toast for 2-3 minutes until golden brown and fragrant, then set aside.
Season the chicken breast with half of the salt, pepper, and dried oregano.
Heat the olive oil in a medium saucepan over medium-high heat. Add the chicken and cook until browned on all sides, about 5-6 minutes, then remove and set aside.
In the same pan, add the diced onion and minced garlic, sautéing for 2 minutes until translucent.
Stir in the dry basmati rice and toast for 1 minute until the grains are slightly translucent at the edges.
Pour in the chicken broth and the remaining salt, pepper, and oregano. Bring to a boil, then reduce heat to low and cover.
Simmer the rice for 12-15 minutes until the liquid is fully absorbed.
Dice the cooked chicken into bite-sized pieces and add them back into the pan with the rice.
Stir in the lemon zest, lemon juice, and fresh parsley to brighten the flavors.
Fluff the rice with a fork and serve topped with the toasted almonds.