Heat oven to 350°F. Spray cookie sheet with cooking spray.
If using crescent rolls: Unroll dough; separate dough into 4 rectangles. Firmly press perforations to seal. If using dough sheet: Unroll dough; cut into 4 rectangles.
Spread cheese over each rectangle. Sprinkle each with shrimp and onions; press in lightly.
Starting with one short side, roll up each rectangle; press edge to seal. With serrated knife, cut each roll into 8 slices; place cut side down on cookie sheet.
Bake 15 to 20 minutes or until edges are golden brown. Immediately remove from cookie sheet. Serve warm.