Cook rice in an Instant Pot or saucepan until done.
Meanwhile, season the chicken with salt and pepper.
Heat the avocado oil in a large skillet over medium heat. Place the chicken in the hot skillet and cook on each side for around 3 minutes or until cooked through. Remove from heat and set aside.
Add the chicken broth, garlic and rosemary in the skillet and stir. Bring to a boil and reduce the heat to simmer for around 3 minutes.
Turn off the heat and stir in the rice, milk and lemon juice. Place the chicken on top of the rice and garnish with lemon slices.