Bring water to a boil. Add the 3 cloves crushed garlic and the cubed potatoes. Boil until fork tender (about 15-20 minutes depending on size of cubes and how starchy the potatoes are). Drain the potatoes and put back in the hot pot.
Add the butter, sour cream, milk and salt. Using a hand mixer blend until smooth (about 2 minutes). Add the cheddar cheese, dry chive, garlic powder and pepper. Use a spoon to incorporate and let sit for about 5 minutes or until the cheese is completely melted. Use the taste test to determine how much more salt and pepper to add.