Step 1: Cook the pasta in a large pot of boiling salted water according to package directions until al dente. Reserve 1 cup of pasta water before draining.
Step 2: While pasta is cooking, season chicken slices with salt and pepper. Heat olive oil and butter in a large skillet over medium-high heat.
Step 3: Add chicken to the skillet and cook for 5-7 minutes until golden brown and cooked through. Remove chicken from the pan and set aside.
Step 4: In the same skillet, reduce heat to medium and add minced garlic. Sauté for 1 minute until fragrant.
Step 5: Add the Boursin cheese and chicken broth to the skillet. Stir constantly until the cheese has melted into a smooth, creamy sauce.
Step 6: Add the cooked pasta and baby spinach to the sauce. Toss well, adding reserved pasta water as needed to reach your desired consistency.
Step 7: Return the chicken to the pan, sprinkle with Parmesan cheese, and serve your creamy boursin chicken pasta immediately.