Preheat oven to 375° F. In a large skillet, cook sausage over medium-high heat, stirring frequently, until thoroughly cooked and no longer pink. Separate crescent rolls into eight triangles. Place in an ungreased 12-inch rimmed pizza pan with points toward the center. Press crescent rolls together, seal perforations and form a circle an inch larger in diameter than bottom of pan. Turn edges under to make a slight rim. Sprinkle cooked sausage evenly over crust. Top with potatoes; add peppers and/or green onions, if desired. Sprinkle with Cheddar cheese. Combine beaten eggs, milk, salt and pepper in a small bowl; stir well. Pour evenly over pizza. Sprinkle with Parmesan. Bake for 15 to 20 minutes or until eggs are set and crust is golden brown.