Line a muffin tin with paper liners and spray the inside of the liners with cooking spray. Set aside.
Preheat oven to 350 degrees.
In a large bowl, whisk together the cornmeal, all-purpose flour, sugar, baking poweder, pumpkin pie spice, and salt.
In a small bowl, whisk together the egg, milk, and melted butter.
Make a well in the center of the dry ingredients and pour in the wet ingredients.
Mix until the batter is wet.
Fold in the pumpkin.
Scoop the pumpkin cornbread muffin batter into the prepared muffin tin.
Fill each muffin cup 3/4 full.
Bake for 20 minutes.
Let mufffins cool for 5 minutes in the tin and then transfer muffins to a cooling rack.
Store cooled muffins in an air-tight container at room temperature, up to 3 days.