Spray a 13x9x2 inch baking dish with cooking spray and Preheat the oven to 350°F.
Use a large mixing bowl to combine the hash browns, 1 tbsp of the Taco seasoning, Toss until evenly coated, then gently press the mixture into the baking dish.
Heat a 10 inch skillet over medium high heat. Spray with cooking spray and add the chorizo (sausage). Cook for 5-7 minutes or until cooked through, drain.
While the chorizo is cooking you grab a mixing bowl and beat the eggs, milk, salt, pepper and the rest of the taco seasoning. Once the eggs have been fully beaten stir in the shredded cheese.
Once the choirzo has been cooked and drained, add it to the egg mixture. Mix and then stir in the salsa.
Pour the chorizo/egg mixture over the hash browns in the baking pan.
Bake, uncovered, for about 40 minutes, or until the egg center has cooked through.
Allow the casserole to cool and set for a bout 10 minutes before serving.