Place potatoes in a small microwave-safe dish; add water. Microwave, uncovered, on high for 8-9 minutes or until tender, stirring once.
Meanwhile, in a large nonstick skillet, cook bacon over medium heat until crisp. Remove to paper towels to drain. Crumble bacon and set aside.
With the bottom of a glass, flatten potatoes to 1/2-in. thickness. In the same skillet coated with cooking spray, cook potatoes in dressing over medium heat for 2-3 minutes or until bottoms are golden brown.
Turn potatoes; sprinkle with cheese and reserved bacon. Cover and cook 2-3 minutes longer or until cheese is melted. Serve with sour cream if desired.
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