Wash the apples. Core each apple by removing the center, but leave the bottom intact. Remove a thin strip of peel around the cavity if desired.

In a small bowl, mix the brown sugar and apple pie spice.

Fill the cavity of each apple with the sugar and spice mixture. Place 1 teaspoon of butter on top of each filled apple.

Place the apples in a deep, microwave-safe dish. Cover the dish loosely with microwave-safe plastic wrap, leaving a small gap for steam to escape.

Microwave on high for 3 to 5 minutes until the apples are tender when tested with a fork. Let the apples sit for 2 minutes before serving.

Serve the baked apples warm. Optionally, top with a scoop of vanilla ice cream or a dollop of yogurt for an extra treat.