Egg, Biscuit and Sausage Gravy Breakfast Casserole

INGREDIENTS

1 lb

roll of bulk pork breakfast sausage (like Jimmy Dean)

2 tbsp

butter , plus more for the pan

1/4 cup

all purpose flour

2 cups

milk , more or less, as needed

1/4 tsp

freshly ground black pepper , or to taste

1/4 tsp

kosher salt , or to taste

1 cup

self rising flour

2 tbsp

cold unsalted butter , cubed

1/3 cup

buttermilk

1 cup

shredded cheddar cheese

large eggs

1/4 cup

milk

Salt and pepper ,