What’s the one day of the year most breakfast casseroles are made?

Christmas morning, actually.

This recipe is inspired by a Jimmy Dean sausage ad pulled from a magazine 20 years ago.

A Portion Size of Sausage Breakfast Casserole Lifted from a Casserole Dish Using a Spatula

Simply Recipes / Sally Vargas

Cut it into squares to serve!

Mix Up the Fillings

This recipe takes very well to adaptation.

Swap out the ground sausage for ground beef, shredded chicken, or leftover diced ham.

Slices of Sausage Breakfast Casserole on a Plate with Some on a Fork

Simply Recipes / Sally Vargas

Swap out the cheddar cheese for something like Swiss or Monterey Jack.

If you have leftover cooked potatoes or sweet potatoes, those would also make a good addition.

Don’t forget the coffee.

Sausage Breakfast Casserole Lifted from a Casserole Dish Using a Spatula

Simply Recipes / Sally Vargas

When its completely cooked, the skewer will come out dry, not wet.

Note: The more add-ins, the longer the casserole will take to bake.

When lightly browned, remove from pan to a paper towel lined plate to absorb any excess fat.

Raw Sausage Chunks on a Skillet for Breakfast Casserole Recipe

Simply Recipes / Sally Vargas

Place the cubed bread in a well-buttered 9 x 13-inch baking pan.

Sprinkle with chopped tomatoes and mushrooms, if using.

Top with the browned crumbled sausage, distributing it evenly.

Sausage Browned and Broken into Smaller Pieces on a Skillet for Sausage Breakfast Casserole Recipe

Simply Recipes / Sally Vargas

Pour the egg milk mixture evenly over the bread and cheese.

When ready to bake, preheat the oven to 325F.

Bake uncovered for about 1 hour.

Liquid Ingredients Mixed Together for Breakfast Casserole

Simply Recipes / Sally Vargas

Tent with foil if the top begins to brown too quickly.

Let the casserole cool for about 10 minutes before serving.

Leftovers will keep in the refrigerator for about a week.

Cubed Bread Pieces in a Buttered Casserole Dish for Breakfast Casserole with Sausage

Simply Recipes / Sally Vargas

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Tomatoes, Cheddar, and Mushroom Added to Casserole Dish for Breakfast Casserole with Sausage Recipe

Simply Recipes / Sally Vargas

Browned Sausage Added to Casserole Dish

Simply Recipes / Sally Vargas

Egg Mixture Poured into Casserole Dish

Simply Recipes / Sally Vargas

Sausage Breakfast Casserole Ingredients Resting in Casserole Dish

Simply Recipes / Sally Vargas

Sausage Breakfast Casserole After Resting in Egg-Milk Mixture

Simply Recipes / Sally Vargas

How to Make Sausage Breakfast Casserole

Simply Recipes / Sally Vargas