01 -
Pat chicken pieces dry with paper towels. Season evenly with 0.75 teaspoon kosher salt and black pepper.
02 -
Heat 15 ml olive oil in a large skillet over medium heat. Add half the chicken in a single layer and cook until golden brown on the bottom and releases easily, about 3–5 minutes. Flip and cook the other side until golden, about 2 minutes. Transfer to a plate. Repeat the process with the remaining olive oil and chicken, then transfer all chicken to the plate.
03 -
Pour the water and remaining 0.25 teaspoon kosher salt into the skillet, scraping up any browned bits. Arrange trimmed asparagus in an even layer. Cover and cook until nearly crisp-tender, stirring once halfway through, 1–3 minutes.
04 -
Add unsalted butter to the skillet. Once melted, return chicken and any juices to the pan. Stir in minced garlic and red pepper flakes if using. Cook, stirring occasionally, until the chicken is fully cooked and the asparagus is bright green and crisp-tender, 2–3 minutes.
05 -
Top with finely chopped parsley if desired and serve immediately.