Potato, Sausage, and Broccoli Breakfast Casserole

Prep time: 10 minutes
Cook time: 45 minutes
Serves: 4

Ingredients:

Non-stick cooking spray
½ lb. bulk Italian sausage (no casings)
1 small red onion, diced
1 large russet or Idaho potato, diced
2 large eggs
3 T. whole milk
2 c. fresh broccoli, diced
¾ c. sharp cheddar cheese, shredded, divided
2 T. fresh chives, finely chopped
Sea salt and black pepper, to taste