Step 1: Cook the penne pasta according to package directions until al dente, then drain and set aside.
Step 2: Season chicken breasts with salt and pepper. Heat olive oil in a large skillet over medium-high heat and cook chicken for 6-7 minutes per side until golden and cooked through. Remove, let rest, then slice into strips.
Step 3: In the same skillet, reduce heat to medium and sauté minced garlic for 1 minute until fragrant.
Step 4: Pour in heavy cream, pesto, and chicken broth, stirring to combine. Bring to a gentle simmer.
Step 5: Stir in grated Parmesan cheese until melted and the sauce thickens slightly, about 3-4 minutes.
Step 6: Add cooked pasta and sliced chicken to the sauce, tossing to coat evenly and heat through.
Step 7: Garnish with fresh basil leaves and serve immediately.