you would need to double the cooking time just about. You will need to check it before serving to make sure it cooks through. Then make note of the time it took to cook it thoroughly. Cooking at lower temperatures will not crisp the exposed edges of recipes the way cooking at higher temperatures does.
12.5 degrees for one minute so multiply 12.5 with 28 makes 350 degrees so about 28 minutes!
There are so many recipes out there for recipes including breakfast ones. Some that I really like are: Bacon Egg Casserole at Cooks.com, and Maple Bacon Breakfast Casserole from recipes.sparkpeople.com.
If you want to make a good breakfast for your husband you should try Turkey Sausage Breakfast here is the whole recipe http://allrecipes.com/Recipes/breakfast-and-brunch/breakfast-casserole/main.aspx
Breakfast casserole are not as prolific as dinner ones but there are a few of them available. Many of them offer a good breakfast option and usually include bacon or other traditional breakfast items in them.
A recipe you might consider is a sausage and potato casserole. Use sausage, a bit of flour, a cup and a half of milk, hash browns, and cheese for the casserole.
try either Pillsbury or allrecipes web site.
This recipe from Betty Crocker is very easy and is designed for a crowd: http://www.bettycrocker.com/recipes/impossibly-easy-breakfast-bake-crowd-size/b9412093-eaf2-46fd-bc9e-967ae7af7b6c
You can find many casserole recipes in cookbooks. The library has cookbooks. You could subscribe to cooking magazines, or search recipe websites for recipes.
There are many places online that you can find recipes for a sausage breakfast casserole Try looking in the latest cooking magazines as well as online places like www.jimmydean.com where you can find some easy ways to make it
I microwave mine for 2 minutes.
Having read the recipe was a casserole baked for the guest?
simplyrecipes.com has some really delicious breakfast casserole recipes. But if you really want to keep the tradition alive I would suggest you ask your mum how she makes them. She will also be able to show you how to do it exactly which I find easier than following a recipe.
Countless recipes can be found at food.com, foodnetwork.com, allrecipes.com, bettycrocker.com/recipes, simplyrecipes.com, and epicurious.com. You can filter results to only include breakfast casseroles and onions.