This casserole takes the core elements of a Scotch egg — sausage meat, boiled eggs, and breadcrumbs — and bakes them together in a single dish with a mustard-spiked custard and sharp cheddar on top. It feeds six people from one pan, comes out in neat slices, and puts serious protein on the plate without much fuss. If you need a make-ahead brunch that actually holds together when you cut it, this is a reliable choice.
Shopping notes
- Pork breakfast sausage: Buy uncased bulk sausage meat if your store carries it — it saves you squeezing links out of casings. Look for one with a visible fat content around 20%; leaner sausage can turn dry after 45 minutes in the oven.
- Day-old bread: Any sturdy white or sourdough loaf works. Fresh sandwich bread gets too soggy — let it sit out overnight or dry it in a low oven for 10 minutes if you forgot to plan ahead.
- Dijon mustard: Standard Dijon from any brand is fine. Whole-grain mustard also works and adds small pops of texture to the custard.
- Sharp cheddar: Block cheddar you shred yourself melts more evenly than pre-shredded, which is coated with anti-caking starch.
Why this recipe works
Two things carry this dish. First, browning the sausage properly before it goes into the pan — not just cooking it through, but getting real color on it — builds the savory base that the mild custard needs to taste like something. Second, the custard ratio (two eggs to three-quarter cup of milk plus Dijon) is thick enough to set firmly around the bread and sausage without turning rubbery, so the slices hold their shape on the plate rather than collapsing. Those two steps are where the texture and flavor actually come from; everything else is assembly.
Troubleshooting
- Center is still liquid after 45 minutes: Oven temperatures vary. Tent the top loosely with foil to stop the cheese from burning and give it another 8–10 minutes. The knife test is the right call — pull it when the knife comes out clean, not by the clock alone.
- Bread floats up through the sausage layer: Press the bread cubes down firmly into the dish before adding the sausage, and let the assembled casserole sit for 5 minutes after pouring the custard so the bread absorbs some liquid and stays put.
- Egg yolks look grey-green after slicing: That’s a sign the hard-boiled eggs were overcooked. For clean yellow yolks, bring water to a boil, lower eggs in gently, cook exactly 10 minutes, then transfer straight to an ice bath.
- Sausage layer is greasy: After browning, transfer the sausage and onion mixture to a paper-towel-lined plate and blot briefly before spreading it into the dish. Excess fat can make the custard greasy and prevent it from setting cleanly.
- Cheese is browning too fast before the center sets: Cover with foil after the first 25 minutes and remove it for the last 10 to finish the top without over-browning.
Leftovers and meal prep
Leftovers keep well in the fridge for up to 3 days — cover the dish tightly or transfer slices to an airtight container. Reheat individual portions in a 325°F oven for 12–15 minutes or in a microwave on medium power to avoid rubbery eggs. Skip the garnish of fresh herbs on reheated portions — not worth the extra dish. You can also assemble the entire casserole the night before, cover it, and refrigerate unbaked; add 5 minutes to the bake time since it starts cold. Freezing is possible but the custard texture softens on thawing, so fridge storage is the better option if you’re planning just a day or two ahead.
Scotch Egg Casserole
Equipment
Ingredients
- 1 lb pork breakfast sausage - choose high-quality, uncased sausage meat
2 cups bread - day-old, cut into 1/2-inch cubes
- ¾ cup whole milk
Instructions
- Preheat your oven to 375°F (190°C). Grease a 9x13-inch baking dish with butter or oil and set aside.
- In a skillet over medium heat, brown the sausage, breaking it into small chunks. After 5–6 minutes, add the diced onion and garlic. Cook until everything is golden and fragrant, about 3–4 more minutes. Remove from heat and let cool slightly.
- Slice each hard-boiled egg in half vertically and set aside.
- In a mixing bowl, whisk together the eggs, milk, Dijon mustard, salt, and black pepper until smooth.
- Place the bread cubes in the greased baking dish. Top with the sausage mixture, spreading evenly. Nestle the halved boiled eggs into the mixture, yolk-side up for presentation.
- Pour the egg-milk mixture over the top, ensuring even coverage. Sprinkle the shredded cheddar cheese over everything.
- Bake for 40–45 minutes until the top is golden and the center is just set (a knife inserted should come out clean). Let rest 5 minutes before slicing.
Notes
- Swap pork sausage with chicken or turkey sausage for a lighter variation.
- Add fresh chives or parsley to the egg mixture for an herbal note.
- For added crunch, toast the bread cubes lightly before layering.
Nutrition
Common questions
Can I use raw eggs instead of hard-boiled eggs in the casserole?
No — the boiled eggs need to be fully cooked before they go in. The custard baking time is calibrated for set eggs; raw eggs in the center would be undercooked when the rest of the casserole is done, and pork sausage must reach 160°F (71°C) internally, which takes longer than it would take a raw egg to overcook.
How do I know the sausage is fully cooked inside the casserole?
Brown it thoroughly in the skillet before assembling — it should be cooked through at that stage, not just browned on the outside. If you want to double-check, an instant-read thermometer inserted into the sausage layer of the finished casserole should read at least 160°F (71°C).
Can I make this with turkey or chicken sausage instead of pork?
Yes, and it works well. Ground poultry sausage must reach 165°F (74°C) internally, so make sure it’s fully cooked through in the skillet before assembling — don’t pull it while it still looks pink.
My casserole came out watery on the bottom — what went wrong?
The most common cause is bread that was too fresh and released moisture instead of absorbing the custard. Use properly dried or day-old bread, and make sure the sausage was blotted of excess grease before layering — pooled fat can also collect at the bottom during baking.
More mince recipes to try
- Sweet Savory Scotch Eggs
- Cumberland Sausage Mince Pie
- Savory Pork Stottie Filling
- Hearty Beef Pie Casserole
