Wash potato thoroughly and pat completely dry. Pierce 3 to 4 times with a fork.
Place potato on microwave-safe plate and microwave 7 minutes, turning over halfway through cooking. If your potato isn’t fork-tender after 7 minutes, continue microwaving in 1 minute increments until fully cooked. Let rest for 2 minutes.
Split potato down the middle, being careful of steam. Season with salt and pepper, and top with butter before serving.