Thaw dough in refrigerator 12 hours.
Combine feta and next 7 ingredients (feta through egg white) in a bowl.
Roll dough into a 16 x 10-inch rectangle on a lightly floured surface. Spread spinach mixture over dough, leaving a 1/2-inch border. Beginning with a long side, roll up jelly-roll fashion; pinch seam and ends to seal. Place roll, seam side down, on a baking sheet coated with cooking spray. Cut diagonal slits into top of the roll using a sharp knife. Cover and let rise in a warm place (85°), 1 hour or until doubled in size.
Preheat oven to 350°.
Sprinkle Parmesan cheese over the top of the roll. Bake at 350° for 45 minutes or until golden.
Absolutely delicious! I have made this as a weekend snack and for parties. It has always been a huge hit. Just be sure not to roll out the dough too thin or it will tear when moving to a baking sheet and definitely crack during baking.