Rinse the quinoa under cold water. Put it in a saucepan with water and a pinch of salt. Bring it up, then lower the heat. Lid on. Let it cook without messing with it.
While that’s going, pat the chicken dry. More than you think you need to. Rub it with olive oil, salt, pepper, and whatever seasoning you’re using.
Heat a grill pan or grill until it’s properly hot. Place the chicken down and leave it alone. Don’t move it right away. Let it cook until it releases on its own.
Flip the chicken and cook the other side until done. Cooking time depends on thickness. When it’s finished, take it off the heat and let it rest for a few minutes.
Check the quinoa. When the water is gone, turn off the heat and let it sit with the lid on. Fluff it when you’re ready to serve.
Heat a pan with a small amount of oil. Add the spinach and a pinch of salt. Stir just until it wilts, then stop.
Plate everything. Chicken, quinoa, spinach. However it lands is fine.