Preheat oven to 350 F.
Separate crescent rolls and line an ungreased 9'' pie plate with them; press together to form a pie crust.
Brown ground beef and onion in a skillet; drain. Add tomato sauce and taco seasoning; simmer for 5 minutes.
Pour into pie plate. Spread sour cream over top; sprinkle with cheese. Bake for 20 minutes.
Top with lettuce, tomatoes, and olives.
Adapted from Gooseberry Patch Almost Homemade Cookbook