Mexican Lasagna

*I got this recipe from my boss who entertains about 10-15 teenagers each weekend. This is one of their favorties:

1 lb. ground beef
1 (16 oz) can refried beans
2 tsp dried oregano
1 tsp cumin
1 tsp garlic powder
12 uncooked lasagna noodles
2 cups water
2 cups picante sauce
2 cups sour cream
2 cups shredded cheese

Combine beef (raw), beans and seasonings. Place layer of uncooked noodles in bottom of 9 x 13" pan. Spread half of meat mixture over noodles. Top with noodles then other 1/2 of mixture, then noodles again.
In bowl mix together water and picante. Pour evenly over layers. Cover tightly with foil. Bake 1 1/2 hours at 350*. Spoon sour cream over lasagna, and top with cheese. Bake uncovered until cheese melts; about 5-10 minutes.