Cheesy Sausage Hash Brown Breakfast Bake

Name: Cheesy Sausage Hash Brown Breakfast Bake
Ingredients: 1 pound (16 ounces) breakfast sausage (See Tip 2); 1 small onion chopped (about 3/4 cup or 3.5 ounces); 10 large eggs; 1 1/2 cups (12 ounces) 4% cottage cheese; 1 teaspoon Kosher salt; 1/2 teaspoon freshly ground black pepper; 2 cups (8 ounces) shredded extra sharp cheddar cheese (See Tip 3); 1 1/2 cups (6 ounces) shredded Swiss cheese (See Tip 4); 20 ounce package of refrigerated hash browns (about 4 2/3 cups); 1 Tablespoon sliced green onion tops for garnish (optional)