Cheesy Hash Brown and Egg Breakfast Casserole

Bahan-bahan (4 porsi)

• 2 Tbsp unsalted butter (divided)
• 1 small onion (1/2 cup finely chopped)
• 4 medium mushrooms (sliced)
• 1 Tbsp olive oil
• 1 lb frozen hash browns
• 6 large eggs
• 1/4 cup sour cream
• 1/2 tsp Mrs. Dash salt-free seasoning (or your favorite seasoning)
• 1/4 tsp sea salt and 1/8 tsp pepper (or to taste)
• 4 oz about 1/2 cup ham, sliced into 1" long strips.
• 1 cup shredded Mexican cheese (divided)
• 6 -8 baby red tomatoes (halved)
• Cilantro or Fresh chives for garnish
• I used an 8" cast iron skillet OR You can also use a regular pan for the hash browns and then bake in a deep pie pan or a casserole dish.