Place the dry quinoa in a fine-mesh strainer and rinse thoroughly under cold water to remove any bitterness.
In a small saucepan, combine the rinsed quinoa with 0.5 cup of water, bring to a boil, then reduce heat to low, cover, and simmer for 15 minutes until the water is absorbed and quinoa is fluffy.
While the quinoa cooks, heat the avocado oil in a large skillet over medium-high heat.
Add the ground chicken to the skillet, breaking it apart with a spatula, and cook until browned and no longer pink.
Add the diced red bell pepper and red onion to the skillet with the chicken, sautéing for 4-5 minutes until the vegetables are tender-crisp.
Stir in the chili powder, cumin, garlic powder, sea salt, and black pepper, ensuring the chicken and vegetables are evenly coated in the spices.
Fold the cooked quinoa into the skillet mixture, stirring well to incorporate all the flavors.
Sprinkle the shredded sharp cheddar cheese over the top, cover the skillet with a lid for 1-2 minutes until the cheese is completely melted.
Remove from heat and garnish with freshly chopped cilantro before serving directly from the skillet.