In a large bowl, combine mashed potatoes, bacon, chives, Parmesan cheese, salt, pepper, and garlic powder.
Spray a 12-cup muffin pan with cooking spray and divide the mashed potatoes evenly into each cup,
Make a hole in the center of each mashed potato cup.
Add shredded cheddar to the center of each cup.
Bake mashed potato cups at 400ºF/200ºC for 30-35 minutes or until outside is crispy and brown.
Top with a dollop of sour cream, chives, and bacon crumbs. Enjoy!