Easy Breakfast Casserole

Easy breakfast casserole is the make-ahead workhorse for holiday mornings, brunch potlucks, and overnight house guests. A canned crescent roll sheet acts as the buttery crust, sausage and mushrooms layer in the middle, and beaten eggs blended with cream of onion soup form a savory custard that sets around everything during the long bake.

The overnight chill is what makes this recipe sing. Resting the assembled casserole in the fridge gives the eggs time to soak into the crescent dough, transforming a flat layer of pastry into a tender, almost bread-pudding-style base. Same technique you’d use for strata or French toast bake, just with a savory profile.

Pro Tips

• Press the crescent dough firmly to seal the perforations. Any gaps and the egg mixture leaks under the dough during baking, leaving you with a soggy bottom.
• Drain the cooked sausage well. Excess grease pools at the bottom and makes the dough greasy instead of golden.
• Saute the mushrooms first if they look watery. Raw mushrooms release a lot of liquid that can dilute the custard.
• Don’t skip the overnight rest. Bake immediately and the dough stays raw underneath the egg layer.

Variations

• Swap sausage for cooked, crumbled bacon or diced ham, both noted in the original recipe.
• Use sharp cheddar or pepper jack instead of Monterey for a different flavor profile.
• Add diced bell pepper or chopped spinach to the filling for vegetables and color.