2 lbs. hamburger
1 pkg. dry taco seasoning mix
1 pkg. crescent rolls
8 oz. sour cream
1 egg
8 oz. grated cheddar cheese
8 oz. grated Mozzarella cheese
Taco chips

Brown hamburger; add taco seasoning and 1 cup water; simmer. Line 9x13 pan with crescent rolls. Top with hamburger. Mix 1 egg with sour cream. Pour this over hamburger. Top with grated Mozzarella and cheddar cheese.

Bake at 350 degrees for 30 minutes (covered). Remove from oven and put crumbled taco chips on top. Return to oven (uncovered). Bake for 15 minutes. Cut into squares; garnish with tomatoes, black olives, taco sauce, whatever you want.