Set a large skillet over medium heat. Add some olive oil and the ground chorizo sausage. Cook 6 to 8 minutes breaking it apart as it cooks.

Note: If your ground chorizo comes in links, remove the casings before cooking.

Remove the chorizo onto a plate with paper towels to drain the excess grease. Add a little more olive oil along with the frozen hash brown, onions, and peppers to the same skillet over medium heat.

Season with kosher salt, pepper and fajita or taco seasoning if using. Cook 10 to 12 minutes, stirring a few times

Grease a 9 x 13 casserole dish and layer the potatoes onions and pepper mixture, chorizo, and cheese a few times. Save about a cup of the cheese to sprinkle over top later.

Put the milk, eggs, kosher salt, and pepper a bowl and whisk until evenly. Pour this over the casserole and press down slightly.

Cover with foil and bake in a 375 degree oven for 30 minutes. Remove the foil, sprinkle the remaining cup of cheese over top, and place back in the oven for an additional 15 to 20 minutes.

Let cool and either enjoy this casserole as is or set out flour tortillas and toppings such as sour cream, salsa, hot sauce, and or jalapenos so everyone can build their own tacos or burritos.