Chicken Fettuccine Alfredo

Bahan-bahan (8 porsi)

• 2 lbs Chicken Breast
• 3/4 lbs fettuccine pasta ((or angel hair or vermicelli pasta))
• 1 lb white mushrooms (thickly sliced)
• 1 small onion (finely chopped)
• 3 cloves garlic (minced)
• 3 1/2 cups half and half (*)
• 1/4 cup parsley, finely chopped, (plus more for garnish)
• 1 tsp sea salt (or to taste, plus more for pasta water)
• 1/4 tsp black pepper (or to taste)
• 3 Tbsp olive oil (divided)
• 1 Tbsp unsalted butter