Warm your soul with this dish!

3 cups shredded chicken
1 oz package dried ranch dressing seasoning
3 Tbsp unsalted butter
4 cloves garlic, minced
3 Tbsp all purpose flour
2 cups heavy cream
2 cups half and half
1/2 cup grated Parmesan
1 1/2 cups shredded Mozzarella cheese, divided
1 cup shredded cheddar cheese, divided
salt and pepper, to taste
1 lb. dry large elbow pasta