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Easy Cheesy Overnight Hash Brown Egg Casserole

easy cheesy overnight hash brown egg casserole - featured image

A simple, make-ahead breakfast casserole featuring frozen hash browns, eggs, cheese, and sour cream that bakes to a creamy, cheesy, and crispy perfection. Perfect for busy mornings and family gatherings.

Ingredients

Scale
  • 4 cups (about 450g) frozen shredded hash browns, no need to thaw
  • 8 large eggs (about 400g), room temperature
  • 2 cups (480ml) whole milk or 2% milk
  • 1 cup (240g) sour cream (or Greek yogurt for lighter option)
  • 2 cups (200g) shredded sharp cheddar cheese (Monterey Jack as alternative)
  • 1/2 cup (75g) diced onion, fresh or frozen
  • 1 teaspoon (5g) salt
  • 1/2 teaspoon (1g) black pepper
  • 1/2 teaspoon (1g) garlic powder (optional)
  • Butter or non-stick spray for greasing the baking dish

Instructions

  1. Preheat oven to 350°F (175°C). Lightly grease a 9×13-inch baking dish with butter or non-stick spray.
  2. In a large bowl, whisk together eggs, milk, and sour cream until smooth and slightly frothy.
  3. Add frozen shredded hash browns directly into the egg mixture and stir gently to coat evenly.
  4. Fold in shredded cheddar cheese, diced onion, salt, black pepper, and garlic powder. Mix just until combined.
  5. Pour mixture into the prepared baking dish and spread evenly with a spatula.
  6. Cover the dish tightly with foil and refrigerate overnight or for at least 6 hours to let the hash browns soak up the custard.
  7. The next morning, remove foil and bake uncovered for 55-60 minutes until the top is golden brown and a knife inserted near the center comes out clean.
  8. Let the casserole rest for 5-10 minutes before slicing and serving.

Notes

[‘Do not thaw the hash browns to maintain texture and prevent sogginess.’, ‘Use room temperature eggs and dairy for even baking.’, ‘Mix gently to avoid a dense casserole.’, ‘Cover tightly before chilling overnight to allow flavors to meld and potatoes to absorb custard.’, ‘Let casserole rest after baking to firm up for easier slicing.’, ‘If top browns too quickly, tent loosely with foil halfway through baking.’, ‘Can add veggies or cooked meats before baking for variations.’, ‘Store leftovers in airtight container in fridge up to 4 days; reheat in oven or microwave.’, ‘Freeze portions wrapped well; thaw overnight before reheating.’]

Nutrition

Keywords: hash brown casserole, breakfast casserole, cheesy breakfast, make-ahead breakfast, overnight casserole, easy breakfast, brunch recipe