This method is a bit more old-school, but it's still a great way to warm up a frozen muffin. Just preheat your oven to around 350°F (175°C), wrap your muffin in some aluminum foil, and bake for about 5-10 minutes. It's like giving your muffin a warm hug - gentle, yet effective.
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The oven method is actually a great way to warm up multiple muffins at once, which is perfect if you're feeding a crowd (or just really love muffins). Just line them up on a baking sheet, and let the warmth of the oven work its magic. It's like a muffin party in there - everyone gets along, and everyone gets warm.