This recipe is a modified version of the Southwestern Frittata served at the Joshua Grindle Inn. A wonderful B&B in Mendocino, Ca. I have modified it to more suit my family's tastes. Prepare the night before, and just pop into the oven in the morning for a special breakfast. We always have this as Christmas breakfast. It is in the oven baking while we open presents. You can use egg substitute, but if you do, add additional 1/2 to 1 cup grated cheese. Also, if you like spicy, increase green chilies to 14 oz, and use 1/2 teaspoon Cumin. You can also use corn tortillas instead of the whole wheat.