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Easy Make-Ahead Overnight Egg Casserole Recipe for Perfect Cozy Brunch

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A simple, comforting overnight egg casserole that is easy to assemble and perfect for a cozy brunch. It features a custardy texture with a blend of eggs, cheese, veggies, and optional breakfast meat.

Ingredients

Scale
  • 6 cups cubed day-old bread (French loaf or sourdough)
  • 8 large eggs, room temperature
  • 2 cups whole milk (or half-and-half for richer casserole)
  • 1 cup shredded sharp cheddar cheese
  • 1 cup shredded mozzarella cheese
  • 1 cup diced bell peppers (red, green, or yellow)
  • 1/2 cup chopped green onions
  • 1 cup cooked breakfast sausage or crumbled bacon (optional)
  • 1 tsp Dijon mustard
  • 1/2 tsp garlic powder
  • 1/2 tsp salt
  • 1/4 tsp black pepper
  • 2 tbsp chopped fresh parsley or chives (optional, for garnish)

Instructions

  1. Cube about 6 cups of day-old bread into roughly 1-inch pieces and spread evenly in a 9×13-inch casserole dish.
  2. Cook sausage or bacon until browned and crisp, drain excess fat, and sprinkle over the bread cubes.
  3. Dice bell peppers and slice green onions; scatter over the bread and meat layer.
  4. In a large bowl, whisk 8 large eggs, 2 cups whole milk, 1 tsp Dijon mustard, garlic powder, salt, and black pepper until fully blended and slightly frothy.
  5. Stir in 1 cup shredded cheddar and 1 cup shredded mozzarella cheese into the custard mixture, reserving a small handful for topping.
  6. Pour the egg and cheese mixture evenly over the bread, meat, and veggies; press down gently to help bread soak up the custard.
  7. Cover the casserole tightly with plastic wrap or foil and refrigerate for at least 6 hours or overnight.
  8. Preheat oven to 350°F (175°C). Remove cover, sprinkle reserved cheese on top, and bake uncovered for 45-50 minutes until puffed and golden brown and a knife inserted comes out clean.
  9. Let the casserole rest for 5-10 minutes before slicing. Garnish with fresh parsley or chives if desired.

Notes

Use day-old or stale bread for best custard absorption to avoid sogginess. If top browns too fast, tent loosely with foil halfway through baking. Customize cheeses and veggies as desired. For vegetarian, omit meat and add extra veggies. For dairy-free, substitute milk and cheese with alternatives. For gluten-free, use gluten-free bread cubes.

Nutrition

Keywords: overnight egg casserole, make-ahead brunch, easy casserole, breakfast casserole, cheesy egg bake, cozy brunch recipe

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