Preheat the oven to 400 degrees F (200 degrees C). Grease a 9 1/2-inch square baking dish with cooking spray.
Press hash browns into the bottom and up the sides of the prepared dish. Spray with cooking spray and sprinkle with salt and pepper.
Bake in the preheated oven until lightly browned and crisp all over, 35 to 45 minutes. Note that the top edges will brown very quickly and become very dark; you can cut that away it it becomes too dark.
When the hash browns are baking, heat olive oil in a large skillet over medium heat. Add onion and cook until soft and translucent, 5 to 10 minutes. Add thyme, 1/4 teaspoon salt, and 1/8 teaspoon pepper; cook for 1 minute. Add sausage; cook and stir until crumbly and brown, 5 to 7 minutes. Add bell pepper and mushrooms; cook until mushrooms are tender, about 10 minutes. Drain any excess liquid from the skillet.
Remove hash browns from the oven. Scoop veggie mixture on top.
Combine 4 eggs and 2 egg whites in a bowl with Cheddar cheese and hot sauce. Mix until eggs just come together without being frothy. Pour over veggie mixture and spread evenly.
Return to the oven and bake until eggs are just set, 10 to 12 minutes.
Remove from the oven and spread sliced tomato over top. Lightly season with salt and pepper and sprinkle with parsley. Return to the oven for 1 minute.
Slide a spatula around the edges and slice into 8 pieces. Serve hot.
Nutritional Facts
Per 8 servings
Calories: 253
Carbohydrate: 19g
Fat: 19g
Fiber: 2g
Protein: 14g
Sugar: 2g
Related Recipes
Breakfast Casserole with Hash Browns
Vegetarian Hash Brown Casserole
Egg and Hash Brown Casserole
Best Breakfast Casserole (Hash Browns & Eggs)
Vegetarian Breakfast Casserole with Spinach and Mushrooms
Vegetarian Mexican Breakfast Casserole
Breakfast Casserole in a Slow Cooker
Overnight Slow Cooker Breakfast Casserole
Skillet Breakfast Hash
Sausage Hashbrown Breakfast Casserole
Sausage Hash Brown Breakfast Casserole
Vegan Breakfast Hash with Smashed Potatoes and Tofu