01 - Season chicken pieces thoroughly with salt, black pepper, and smoked paprika if using, ensuring even coating on all sides.
02 - Heat 1 tablespoon butter and 1 tablespoon olive oil in a large skillet over medium-high heat until butter melts and begins to shimmer.
03 - Add seasoned chicken in a single layer without overcrowding. Sear for 3 to 4 minutes per side until golden brown and cooked through to an internal temperature of 165°F. Remove chicken and set aside on a plate.
04 - In the same skillet, add remaining olive oil and asparagus pieces. Sauté for 2 to 3 minutes, stirring occasionally, until asparagus is crisp-tender and vibrant green.
05 - Push asparagus to one side of the skillet. Add remaining butter and minced garlic to the cleared space. Sauté for 30 seconds until fragrant, being careful not to burn the garlic.
06 - Return chicken to the skillet. Add crushed red pepper flakes and lemon juice. Toss everything together for 1 to 2 minutes until all components are well coated and heated through.
07 - Sprinkle fresh chopped parsley over the dish. Serve immediately while hot, accompanied by your choice of sides.