Cheesy Sausage and Potatoes Casserole

INGREDIENTS

1 lb

bulk mild breakfast sausage

z (1/2 bag) shredded frozen hash brown potatoes (thawed)

2 tbsp

finely chopped onion

Sauce:

3 tbsp

butter

3 tbsp

flour

1/2 cup

chicken stock/broth

2 cups

milk

4 oz

Velveeta, cubed (see note)

Salt and pepper (see note)

2 tbsp

Panko bread crumbs (optional)