Keep corn in husk and, if husks are dry, briefly rinse under cold water.
Place 1–4 ears of corn (in husk) in the microwave. For 1–2 ears, cook on high for 4–5 minutes; for 3–4 ears, cook on high for 8–10 minutes, adjusting for microwave wattage.
Carefully remove hot corn and let rest 2–3 minutes to allow steam to finish cooking.
Peel back and discard husks and silk; remove any remaining silk with a paper towel if needed.
Spread softened butter over hot corn and season with salt and black pepper; serve immediately.