Sausage Hash Brown Casserole

Name: Sausage Hash Brown Casserole
Ingredients: 1 pound Pork Sausage; 1 Small Onion (finely diced (use a yellow or white onion)); 1 Garlic Clove (minced); 1 tablespoon Fresh Sage (finely chopped (about 4-5 leaves)); 8 Large Eggs; 1 cup Milk (whole or 2% milk); ¾ teaspoon Salt (we use Kosher salt); ¼ teaspoon Black Pepper; 15 ounces Shredded Hash Brown Potatoes (thawed and excess moisture removed (if necessary)); 8 ounces Shredded Cheddar Cheese; Cooking Spray or Oil (to grease the casserole dish); Sliced Green Onions or Other Fresh Herbs (for garnish (optional))