Mascarpone Pasta with Chicken, Bacon and Spinach

INGREDIENTS

• 6 slices bacon
• 2 tablespoons olive oil
• 1 cup minced onion
• 3 pounds skinless, boneless chicken breast halves, cubed
• 1/2 teaspoon garlic powder
• salt and ground black pepper to taste
• 3 tablespoons drained and chopped sun-dried tomatoes packed in oil
• 2 tablespoons prepared pesto sauce
• 1/2 pound fresh spinach
• 1 (8 ounce) container mascarpone cheese
• 2 cloves garlic, minced
• 1 tablespoon Dijon mustard, or more to taste
• 1 lemon, juiced
• 1/2 cup milk
• 1/4 teaspoon white pepper
• 1/2 cup grated Parmesan cheese
• 1 (16 ounce) package farfalle (bow tie) pasta
• 1 tablespoon grated Parmesan cheese, or to taste