Gather the ingredients.
Bring a large pot of lightly salted water to a boil; cook rotini at a boil until tender yet firm to the bite, about 8 minutes; drain.
Place bacon in a skillet over medium-high heat and cook until evenly brown. Drain and chop.
Mix mayonnaise, ranch dressing mix, garlic pepper, and garlic powder together in a large bowl. Stir in milk until smooth.
Place rotini, bacon, tomato, black olives, and cheese in a bowl and toss to coat with dressing.
Cover and chill at least 1 hour in the refrigerator. Toss with additional milk if the salad seems a little dry.
