Preheat oven to 350.

Brown ground beef. Add refried beans, oregano, garlic powder, and cumin.

Spray a 9x13 pan with non-stick spray and add a layer of 4 lasagna noodles to the bottom of the pan

Spread 1/2 the meat mixture over the noodles.

Layer the remaining noodles over the meat mixture.

Spread the remaining meat mixture over the noodles.

Combine salsa and water. Pour over casserole.

Tightly cover with foil and bake 60 to 90 minutes or until noodles are tender.

Uncover and spread sour cream over lasagna. Sprinkle cheese over sour cream.

Bake uncovered for 10 minutes. Let sit for at least 10 minutes before serving.