Preheat a waffle iron to medium-high.
Squeeze potatoes between paper towels to remove excess liquid. Toss potatoes with salt, pepper, garlic powder, and onion powder. Brush both sides of waffle iron evenly with butter.
Add potatoes to iron, evenly mounded. Close iron, pressing lightly (iron may not close completely right away); cook 2 minutes.
Press iron to close completely; cook 12 minutes or until golden brown and crisp.
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