Preheat oven to 350 degrees Fahrenheit and grease a 9x13 inch pan.
Mix onions with the sour cream, cream soups, chilis, cheese, and any optional ingredients you have chosen in a medium size bowl.
Spread a small amount of the mixture on the bottom of the 9x13-inch pan. Put a layer of flour tortillas over. Layer your mixture with the flour tortillas as you would a lasagna. End with a layer of the mixture on top.