Season the chicken breast evenly on both sides with sea salt and black pepper.
Heat the olive oil in a large stainless steel or cast-iron skillet over medium-high heat.
Place the chicken in the skillet and sear for 6-7 minutes per side until a golden-brown crust forms and the internal temperature reaches 165 degrees Fahrenheit.
While the chicken is searing, steam or roast the asparagus spears until they are tender-crisp.
Remove the chicken from the pan and set it aside on a plate to rest for 5 minutes.
Reduce the heat to medium and add the minced garlic to the same skillet, sautéing for 30 seconds until fragrant.
Pour in the chicken broth and lemon juice, using a wooden spoon to scrape up the flavorful browned bits from the bottom of the pan.
Stir in the dried oregano and simmer the sauce for 1-2 minutes until it has slightly thickened.
Slice the chicken and serve it over the fluffy cooked quinoa with the asparagus on the side, spooning the warm lemon-herb sauce over the top.