Part 1: The Flavor Foundation

1. Prep the Quinoa: Place the 1 cup of quinoa in a fine-mesh sieve. Rinse it thoroughly under cold running water for at least 30-60 seconds, rubbing the grains with your fingers. This step is crucial to remove the natural coating called saponin, which can give the quinoa a bitter or soapy taste. Set aside to drain.

2. Season the Chicken: Pat the chicken thigh pieces dry with a paper towel. Season them generously with salt and pepper.

3. Sear the Chicken: Heat 1 tablespoon of olive oil in a large, deep skillet or Dutch oven with a tight-fitting lid over medium-high heat. Once the oil is shimmering, add the chicken pieces in a single layer (work in batches if necessary to avoid overcrowding). Cook for 3-4 minutes per side, until golden brown and a nice crust has formed. The chicken does not need to be cooked through at this point. Remove the seared chicken from the pot with a slotted spoon and set it aside on a plate.

Part 2: Building the Dish

1. Sauté Aromatics: Reduce the heat to medium. Add the remaining 1 tablespoon of olive oil to the same pot. Add the chopped onion and cook, stirring occasionally, for 4-5 minutes, until it has softened. Add the minced garlic and cook for another minute until fragrant, being careful not to let it burn.

2. Toast the Quinoa and Spices: Add the rinsed and drained quinoa to the pot. Stir to coat it in the oil and aromatics. Let it toast for 1-2 minutes, until it becomes fragrant. This step enhances the natural nutty flavor of the quinoa. Stir in the smoked paprika, dried oregano, salt, pepper, and optional red pepper flakes, and cook for another 30 seconds to bloom the spices.

3. Combine and Simmer: Pour in the 2 cups of chicken broth, using your spoon to scrape up any delicious browned bits from the bottom of the pot. Stir in the chopped sun-dried tomatoes. Return the seared chicken (and any accumulated juices from the plate) to the pot.

4. The Simmer: Bring the mixture to a rolling boil. Once boiling, immediately reduce the heat to the lowest possible setting and cover the pot with a tight-fitting lid. Let it simmer gently for 15-20 minutes, or until the quinoa is cooked and most of the liquid has been absorbed. Do not lift the lid during this time!

Part 3: The Finishing Touches

1. The Crucial Rest: Remove the pot from the heat and let it stand, still covered, for 5 minutes. This step is essential. It allows the quinoa to steam, absorb the remaining moisture, and become light and fluffy.

2. Fluff and Finish: Remove the lid and use a fork to fluff the quinoa. Add the 4-5 cups of fresh spinach to the pot. The residual heat from the dish will be enough to wilt the spinach perfectly in just a minute or two.

3. Brighten and Serve: Squeeze the fresh lemon juice all over the dish and stir in the fresh chopped parsley. Give everything one final gentle stir. Taste and adjust seasoning with more salt and pepper if needed. Serve immediately.