Cook ground beef and onion in well-seasoned 11 to 12-inch heavy skillet with heat-proof handle over medium coals* until no longer pink, stirring occasionally to break up beef. Remove beef mixture to paper towel; season with salt. Pour off drippings, leaving skillet "greased".
Separate crescent roll dough triangles; place in skillet, pressing edges together to form bottom crust and 1- inch rim up side of skillet. Spread half of pizza sauce over dough; spoon ground beef mixture over sauce.
Top with mushrooms, olives and bell pepper. Pour remaining sauce over all; sprinkle with cheese and oregano. Place skillet in center of grid over medium coals
Place cover on cooker and cook 20 to 30 minutes or until crust is lightly browned.