annak,
I would hardly call this gourmet but it's a strata my family enjoys, and works well in a 13 X 9 pan. Plus you can make a few the night before and just bake them off as needed the next day. I kind of eyeball everything but this would be my guess on the ingredient amounts per pan.
1 lb. fresh ground italian sausage
1/2 red bell pepper, diced
1/2 green bell pepper, diced
8 oz cremini mushrooms, sliced
1/2 yelow onion, diced
6 slices white bread
6 eggs
1 cup half and half or milk
1 generous tsp salt
1 tsp dry mustard
1/2 tsp black pepper
1 1/2 cups grated sharp cheddar, divided
Take the crusts off the bread, cube, and let it sit and stale up a little aside.
In a large skillet, brown the sausage, seasoning as you go, and when it's about done, add in your veg (their liquid will deglaze the pan) and sautee until the veg loses most of its' liquid. Set aside and let cool.
In a large bowl, beat the eggs and whisk in the half and half/milk, salt, pepper, and mustard. Fold in a cup of the cheese and bread cubes, then the cooled sausage/veg mix. Combine thoroughly. Pour into a buttered 13 X 9 pan, top with the last 1/2 cup of cheese, cover with plastic and let it setup overnight.
Bake at 350, uncovered, until the egg is just set in the middle, about 20-25 minutes.
Best of luck!