In a bowl, mix all of the ingredients together and pour into a greased 9x9" or 9x13" baking pan. (NOTE: Ours fit in an 9" baking pan with deep sides. This casserole WILL expand slightly while baking so if you are afraid of it spilling over or want it to bake more quickly, use a 9x13 baking pan. Baking time will change if you use a different pan.)
This casserole will take about 60-70 minutes to bake if using a square 9x9 baking dish or 45-50 minutes in a 9x13 baking pan. Bake until lightly browned and set in the center. (The exact time will depend on the pan you use so watch it closely. The center should not be jiggly. If it is a deep casserole it will take longer to bake.)
Serve immediately with fresh salsa and a dollop of sour cream.
**The time needed to cook this casserole may vary slightly depending on the pan you use. Most times it takes us a full hour to cook it. Plan for up to 70 minutes of baking, but check it several times.The calories shown are based on the recipe serving 8 people, with 1 serving being 1/8 of the casserole. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**