Cheesy Ranch and Bacon Mashed Potatoes

Recipe courtesy of wrysmyguy

Wisk together 1 (1 oz.) package Ranch dressing mix, 1 cup sour cream, and 1 ¾ cups milk in a large glass bowl. Stir in one (22 oz.) package frozen mashed potatoes. Microwave on high for 12 minutes, stirring every 4 minutes. Stir in 6 cooked and crumbled bacon slices and ½-cup cheddar cheese. Garnish with sliced green onion, if desired.