For a milder flavor, remove the seeds and membranes from the jalapenos before chopping. Ensure the spinach is thoroughly drained to prevent soggy pinwheels. If the puff pastry becomes too soft to handle, return it to the refrigerator for a few minutes to firm up. Feel free to experiment with different cheeses, such as Monterey Jack or Pepper Jack, to customize the flavor. For an extra touch of richness, brush the tops of the pinwheels with a beaten egg before baking.