Rinse the quinoa thoroughly in a fine-mesh strainer to remove any bitterness.
In a small saucepan, combine the quinoa and water; bring to a boil, then reduce heat to low, cover, and simmer for 15 minutes until the water is absorbed.
While the quinoa cooks, season the chicken thighs evenly on both sides with the turmeric, ginger, sea salt, and black pepper.
Heat the olive oil in a large skillet over medium-high heat until shimmering.
Add the chicken thighs to the skillet and sear for 5 to 7 minutes per side until the exterior is golden and the internal temperature reaches 165°F.
Remove the chicken from the pan and set aside to rest for a few minutes.
In the same skillet, add the minced red onion and garlic, sautéing for 2 minutes until fragrant and softened.
Add the baby spinach to the skillet and toss for 1 minute until just wilted by the residual heat.
Fluff the cooked quinoa with a fork and plate it alongside the golden chicken and the sautéed greens.