Chili Pie

2 cups Fritos
1 cup onion
1 can chili
1/2 can diced tomatoes with green chilies
1 1/2 cup shredded cheddar cheese

Place 2 cups of Fritos in the bottom of a pie pan. Top with 1 cup diced onion. Mix chili and diced tomatoes together. Pour over Fritos and onion. Top with cheddar. Bake at 350 degrees for 15 minutes. Serve with sour cream.