Preheat oven to 425°F (218°C) and liberally grease a 12-inch pizza pan or rimmed baking sheet.
In a large bowl, mix the hash browns, 1 egg, 0.5 cup of cheddar cheese, salt, and pepper until well combined.
Press the hash brown mixture firmly and evenly into the prepared pan to form the crust.
Bake the crust for 20 minutes or until the edges are golden brown and the surface feels set.
While crust bakes, whisk 4 eggs with milk and scramble in a non-stick skillet over medium heat until partially cooked.
Spread the partially cooked scrambled eggs over the baked hash brown crust.
Top with remaining 1 cup of cheese, cooked sausage, and bell peppers.
Bake for an additional 10 to 15 minutes until the cheese is fully melted and the crust is crisp.
Garnish with green onions and let rest for 5 minutes before slicing.