Preheat the oven to 375˚F. Spread the cubed bread out in a greased 9x13-inch casserole dish. Add cooked, crumbled sausage and shredded pepper jack cheese.
Beat the eggs, milk, sour cream, salt, and black pepper in a bowl.
Pour over the ingredients in the casserole dish and top with shredded cheddar cheese.
Bake at 375˚F for 40-45 minutes, until cooked through.
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Notes
Allow the sausage breakfast casserole to cool completely before covering it and storing it in the refrigerator for 3-4 days. Another option is to cut the casserole into slices, wrap them in plastic wrap, place them in an airtight container or ziptop freezer bag, and store them in the freezer for up to two months.