Cook seasoned chicken:
Season the chicken cubes with salt and pepper. In a large skillet over medium-high heat, warm the olive oil and butter. Add the chicken and cook for 5-7 minutes until golden and fully cooked. Transfer the chicken to a plate and set aside.Sauté onion and orzo:
In the same skillet, sauté the diced onion until softened, about 3-4 minutes. Add the minced garlic and dry orzo; stir constantly for 1 minute until the orzo is lightly toasted and aromatic.Simmer orzo in broth:
Pour in the chicken broth, deglazing the pan by scraping up any browned bits. Bring to a simmer, then lower the heat, cover, and cook for 10-12 minutes until the orzo is al dente and most liquid is absorbed.Stir in Boursin cheese:
Remove from heat. Add the softened Boursin cheese wheel to the skillet. Stir gently until fully melted and a creamy sauce coats the orzo.Combine chicken and spinach:
Return the cooked chicken to the skillet. Add the fresh spinach and stir until just wilted. Serve at once, topped with chopped parsley if desired.