Heat oven to 375°F. Lightly spray cookie sheet with cooking spray.
Unroll dough onto cookie sheet. Spread dressing over dough to within 1 inch of edges. Layer half each of the salami and cheese lengthwise in 5-inch-wide strip down center of dough to within 1 inch of each short side, overlapping salami and cheese. Repeat layering with remaining salami and cheese.
Fold long sides of dough over filling; pinch edges in center to seal. Fold ends under 1 inch; seal. Cut several slits in top for steam to escape.
Bake 20 to 24 minutes or until deep golden brown. Cut crosswise into slices to serve.