Taco bake

2lbs. ground beef(I used caribou)
1/2 C. chopped onion
1 pkg. taco seasoning mix
2C. shredded Cheddar cheese
2 pkgs. crescent rolls
1(8oz) sour cream
salsa

Brown ground beef and onion; drain. Simmer ground beef mixture and taco seasoning 5-10 minutes. Open crescent rolls and spread on jelly-roll pan(baking sheet). Spread meat mixture on rolls. Add cheese. Bake at 325 degrees for 18-20 minutes. Serve with sour cream and salsa.