To prepare a southwest quiche mexican recipe, first you need to prepare the ingredients. First, you'll need the following ingredients: 1 egg, 1 tbsp kosher salt, 1/2 cup shredded cheddar cheese, 2 tablespoons melted butter, and 1 tablespoon sour cream. You can use any type of cheese you like, but I like to use ricotta, cheddar, or asiago cheese. If you don't have any of these ingredients on hand, skip this step. Next, preheat the oven to 375 degrees F (190 degrees C) and grease and flour two 9-inch pie pans with non-stick cooking spray. In another large bowl, mix together the eggs, cream of tartar, milk, salt and pepper. Pour the mixture into the prepared pie shells and bake for 20 to 25 minutes or until the tops are golden brown.