Preheat oven to 425 degrees. Lightly spray a 16 inch round pizza pan with non-stick cooking spray. (DON'T OVER SATURATE WITH SPRAY.) Place 20oz package of refrigerated hashbrowns in center of prepared pizza pan and spread out evenly to edges of pan.NOTE: if you are using hashbrowns from freezer section of your store, make sure they are thawed first to easily make crust.
Sprinkle the hashbrowns on pizza pan with salt and black pepper. Brush melted butter all over the hashbrowns. Place in preheated oven for 15-20 minutes until edges of hashbrowns are golden brown and crispy. Remove from oven. Leave oven on the 425 degrees.
In a medium bowl whisk together eggs, salt, black pepper, garlic powder, and onion powder. Place 1 TBS butter into a medium skillet. Over medium high heat melt butter. Add in egg mixture and cook until eggs are almost set. Remove from skillet and place on a plate. In same skillet break up sausage and cook until browned.
Sprinkle 4 oz shredded cheese all over cooked hashbrown crust. Top with eggs evenly. Top with sausage. Sprinkle with remaining 4 oz of cheese. Top with green onions.
Place back into 425 degree oven for 10-15 minutes until cheese is melted and pizza is heated through. Cut into pizza slices and enjoy.