In a large bowl, stir 2 cups of the flour, ⅓ cup granulated sugar, the salt and yeast with a wooden spoon until well mixed.
In a 1-quart saucepan, heat the milk over medium heat until very warm .
Add the warm milk, ¼ cup butter and egg to the flour mixture.
Stir well with your wooden spoon.
Then stir in enough of the remaining flour, about ½ cup at a time, until dough is soft, leaves side of bowl and is easy to handle.
Sprinkle flour lightly on a countertop.
Place dough on floured surface.
Knead about 5 minutes, sprinkling surface with more flour if dough starts to stick, until dough is smooth and springy.
Spray a large bowl with the cooking spray.
Place dough in bowl, turning dough to grease all sides.
Cover bowl loosely with plastic wrap; let rise in a warm place about 1 hour 30 minutes or until dough has doubled in size.
In a small bowl, mix ½ sugar and the cinnamon; for the filling & set aside.
Spray the bottom and sides of a 13x9 inch pan with the cooking spray.
Sprinkle flour lightly on a countertop .
Place dough on the floured surface.
Using your hands flatten dough into a 15x10-inch rectangle.
Spread ¼ cup butter over dough to within ½ inch of edges.
Sprinkle with sugar-cinnamon mixture.
Beginning at a 15-inch side, roll dough up tightly.
Pinch edge of dough into the roll to seal edge.
Stretch and shape roll until even and is 15 inches long.
Using a sharp serrated knife cut roll into 15 (1-inch) slices.
Place slices slightly apart in the pan.
Cover pan loosely with plastic wrap; let rise in a warm place about 30 minutes or until dough has doubled in size.
Remove plastic wrap.
Move the oven rack to the middle position of the oven.
Heat the oven to 350°F.
Bake 30 to 35 minutes or until golden brown.
Immediately remove rolls from pan; place right side up on a cooling rack.
Cool 5 minutes.