Start by removing the skin from the chicken drumsticks. This step is optional, but it makes the dish lighter. Season the chicken with a sprinkle of salt and pepper.
In a large skillet, heat the olive oil over medium heat. Add the diced onion and sauté for about 3-4 minutes until it becomes translucent. Then, add the minced garlic and cook for an additional minute, stirring frequently to prevent burning.
Increase the heat to medium-high and add the chicken drumsticks to the skillet. Brown the chicken on all sides for about 5-7 minutes, ensuring they get a nice golden color.
Once the chicken is browned, stir in the diced tomatoes, capers, dried oregano, red pepper flakes, and chicken broth. Bring the mixture to a simmer.
Rinse the quinoa under cold water to remove any bitterness, then add it to the skillet. Stir well to combine all the ingredients.
Cover the skillet with a lid and reduce the heat to low. Let it cook for about 25-30 minutes, or until the quinoa is fluffy and the chicken is cooked through. Stir occasionally to prevent sticking.
Once cooked, taste and adjust seasoning with additional salt and pepper if necessary. Serve the Skillet Chicken & Quinoa Supper hot, garnished with fresh herbs if desired.