Preheat oven to 400 degrees. Grease a 12-cup muffin tin.

In a large bowl, combine flours, sugar, baking powder, cinnamon, and salt.

In a smaller bowl or large measuring cup, combine egg, milk, and vegetable oil. Pour wet ingredients into dry and stir until just combined.

Divide batter evenly between muffin cups. Dollop a bit of pumpkin butter into each and swirl into batter using a knife or toothpick.

Bake 20 minutes or until a tester inserted in the middle of muffins comes out clean. Store in an airtight container.