Top with diced ham, bell pepper, green onion, and jalapeno. You can sprinkle cheese on top or stir it into the potato mixture.
In a medium bowl, whisk together eggs, evaporated milk, and spices. Pour egg mixture over casserole.
Cover with plastic wrap and chill in the fridge overnight. Take out from the fridge and bring to room temperature (about 30 minutes before baking)
In a preheated oven to 350 degrees F, bake this hearty breakfast casserole for 50-55 minutes.
You will know that the casserole is done when it’s golden in color and the sides pull away slightly from the pan edges.