1 cups onion, chopped (more or less depending on if you like onions)
3 tablespoons butter
2 x 10 ounce cans diced tomatoes with green chilies
1 x 14-1/2 ounces can stewed tomatoes, chopped
2 lb processed cheese, such as Velveeta
1 lb sharp cheddar cheese, cubed
Corn chips, Triscuits or sliced vegetables
Saute onions in butter. Add tomatoes with chilies and stewed tomatoes; cook until thick. Add processed and cubed cheeses. Cook until thick and smooth, stirring often to keep from sticking.
Refrigerate overnight. Heat to eat. Serve with corn chips, Triscuits or vegetables.