Pat the chicken breast dry with a paper towel and season both sides evenly with sea salt, black pepper, and dried oregano.
Heat the extra virgin olive oil in a large stainless steel or cast iron skillet over medium-high heat until the oil is shimmering.
Place the chicken in the skillet and sear for 5 to 6 minutes per side until the exterior is golden brown and the internal temperature reaches 165 degrees Fahrenheit.
While the chicken is searing, mince the garlic clove and trim the tough, woody ends off the asparagus spears.
Remove the chicken from the skillet and let it rest on a clean plate for 3 minutes to keep the juices locked in.
Add the asparagus and minced garlic to the same hot skillet, sautéing for 3 to 4 minutes until the asparagus is bright green and tender-crisp.
Turn off the heat and stir in the fresh lemon juice and lemon zest, using a wooden spoon to scrape up any flavorful browned bits from the bottom of the pan.
Plate the warm quinoa, top with the sliced chicken breast and sautéed asparagus, and drizzle the remaining lemon-garlic pan sauce over the entire dish.