Enchilada Pie

1 lb ground beef
1 small onion chopped
1 8oz can tomato sauce
1/2 cup water
2 tablespoons chili powder
salt and pepper (optional)
6 small tortilla
1 can sliced olives
2 cups Monterrey/Colby jack shredded cheese
sliced tomato
Butter

Brown beef with onion. Drain off the fat. Stir in tomato sauce, water, chili powder and salt & pepper (optional). Simmer for 1/2 hour. Meanwhile spread butter on tortillas. Using a round casserole dish layer  meat sauce, tortilla, olives and cheese. repeat until your dish is full. Bake at 400* for 15-20 minutes. Garnish with diced tomatoes and sour cream.