Coat the chicken breasts evenly with the Italian herbs, crushed red pepper, salt, and black pepper.
Warm the olive oil in a large skillet over medium heat.
Place the seasoned chicken in the hot skillet and cook for 5–6 minutes on each side, or until completely cooked through and evenly golden on the exterior.
Transfer the cooked chicken from the skillet to a plate and set aside.
Using the same skillet, add the butter along with the minced onion and trimmed asparagus.
Sauté for 2–3 minutes, stirring from time to time, until the vegetables become slightly tender while retaining some firmness.
Stir in the minced garlic and cook for slightly less than 1 minute, taking care to prevent the garlic from browning or burning.
Pour the heavy cream and lemon juice into the skillet with the vegetables.
Stir in the grated Parmesan cheese until evenly incorporated.
Continue stirring as the sauce heats, allowing the ingredients to blend thoroughly and the mixture to begin thickening.
Return the cooked chicken breasts to the skillet and position them within the creamy sauce.
Allow everything to simmer gently for 3–4 minutes, until the sauce reaches a thicker consistency and the chicken is thoroughly reheated.
Taste the sauce and add additional salt or black pepper as necessary.
If the sauce becomes thicker than desired, stir in 1/4 cup water, chicken stock, or chicken broth until the preferred consistency is reached.
Once the chicken is hot and the sauce has thickened to the desired texture, remove the skillet from the heat.
Serve the chicken breasts alongside the asparagus, spooning the warm lemon cream sauce generously over the top.