Pat the chicken breast dry with a paper towel and season both sides evenly with the dried oregano, garlic powder, sea salt, and black pepper.
Heat the olive oil in a large skillet over medium-high heat until shimmering.
Place the chicken in the skillet and sear for 6 to 7 minutes per side, or until the exterior is golden brown and the internal temperature reaches 165 degrees Fahrenheit.
While the chicken cooks, trim the woody ends off the asparagus and set aside.
Remove the chicken from the pan and let it rest on a cutting board for 5 minutes to keep the juices intact.
In the same skillet, add the asparagus and sauté for 3 to 4 minutes until tender-crisp and slightly charred.
In a small bowl, toss the warm cooked quinoa with the fresh lemon juice and chopped parsley.
Slice the chicken into strips and serve it over the fluffy quinoa alongside the roasted asparagus.