Heat a small pot over medium heat. Add the butter and whisk in the garlic. Cook for about 30 seconds, pour in the heavy cream.
Add the season with salt, about 1/2 teaspoon, or to taste.
Cook until the sauce begins to simmer and thicken, about 2-5 minutes. If it's not simmering and thickening just turn up the heat a little until it does. Do not boil or scorch.
Heat oven to 350°F. Grease or spray 13x9-inch pan.
In large bowl, place cooked and drained rotini , shredded cooked chicken, Alfredo pasta sauce and ranch dressing. Stir to combine. Pour mixture in pan; spread evenly.
sprinkle with shredded mozzarella cheese . then Sprinkle chopped cooked bacon evenly over top,
Bake 15 to 20 minutes or until hot and bubbly. Let stand 5 minutes before serving. Sprinkle with chopped parsley.
Serve immediately, garnished with parsley, if desired.