Lemon Asparagus Chicken Pasta

In a large pot of salted boiling water, cook pasta according to package directions until al dente. Drain and return to pot. In a skillet over medium heat, heat olive oil. Add chicken and season with salt, pepper, and Italian seasoning. Cook until golden and no longer pink, 8 minutes per side. Transfer to a plate to let rest, then thinly slice. To skillet, melt butter over medium heat. Add red onion and asparagus and season with salt and pepper. Cook until tender, 5 minutes, then add heavy cream, chicken broth, lemon juice, and garlic and simmer 5 minutes. Stir in cheeses and let cook until melty, then add lemon slices and cooked linguine. Top with sliced chicken and garnish with more Parmesan and parsley.