Try this Sausage Breakfast Casserole recipe.
Swapping standard milk for heavy cream introduces excess fat that coats the eggs and prevents proper protein coagulation, leaving you with a greasy puddle instead of a set custard. Many cooks ruin this dish by ignoring the excess moisture trapped in frozen potatoes. Thawed hash browns release liquid during baking, which dilutes the egg mixture and sabotages the crust.
When eggs cook, their proteins unfold and bond together to trap liquid. Starch from the shredded potatoes acts as a structural stabilizer, absorbing stray moisture while the sausage fat provides richness. To ensure the potatoes brown rather than steam, press them firmly in a clean kitchen towel to extract excess water before mixing.
Bake the casserole at 350 degrees Fahrenheit until a knife inserted into the center emerges clean, usually around 45 minutes. Allowing the assembled dish to rest for 10 minutes before slicing lets the internal temperature stabilize and finalizes the protein matrix.