Overnight Sausage and Hash Brown Breakfast Casserole

• 1 lb breakfast sausage, bulk, raw
• 1 small onion, finely diced
  Swaps for onion

  Instead of onion

  • Another onion: The same amount. Yellow is the all-rounder; white is sharper and crisper; red is milder raw and adds color; sweet onions are mildest.
  • Shallots: The same amount, chopped. Milder and sweeter, with a hint of garlic.
  • Leeks: About 1½ times as much, white and light green parts. Milder and softer when cooked.

  All 4 swaps for onion

• cooking spray, or butter, for the dish
• 1 ⅞ lb frozen shredded hash browns, thawed (one bag)
• 2 cups cheddar cheese, shredded, divided ≈ 226 g
  Swaps for cheddar cheese

  Instead of cheddar

  • Colby or Colby Jack: The same amount. Milder and softer, and melts very smoothly.
  • Monterey Jack: The same amount. Mild and buttery, one of the best melting cheeses.
  • Gouda or Gruyère: The same amount. Nuttier and richer; melts beautifully.

  All 4 swaps for cheddar

• 10 large eggs
  Swaps for eggs

  Instead of eggs

  • Flax egg: 1 tbsp ground flaxseed + 3 tbsp water for each egg. Binds well but gives less lift, so bakes are a little denser and flatter, with a mild nutty taste and brown flecks.
  • Chia egg: 1 tbsp chia seeds + 3 tbsp water for each egg. Works like a flax egg: good binding, little lift, slightly denser crumb.
  • Unsweetened applesauce: ¼ cup for each egg. Moister and denser, with a soft, slightly gummy crumb if you swap more than one egg.

  All 5 swaps for eggs

  Cooking for an allergy? Check every label.

• 2 cups whole milk
  Swaps for whole milk

  Instead of milk

  • Unsweetened soy milk: The same amount. The closest plant milk for baking: its protein helps things brown and set.
  • Unsweetened oat milk: The same amount. Creamy and mild with a hint of sweetness.
  • Unsweetened almond milk: The same amount. Thinner and less rich, so cakes are a little paler and drier.

  All 5 swaps for milk

  Cooking for an allergy? Check every label.

• 1 tsp kosher salt
  Swaps for kosher salt

  Instead of salt

  • Table salt or fine sea salt: About half as much as Diamond Crystal kosher, about ¾ as much as Morton kosher. The same saltiness when measured this way.
  • Salt by weight: 1 tsp is about 6 grams of table salt, 5 grams of Morton kosher, 3 grams of Diamond Crystal kosher. The most reliable way to swap, especially in baking and brines.

  More for salt

• ½ tsp black pepper
• ½ tsp mustard powder
• 2 green onions, sliced, to finish (optional)
  Swaps for green onions

  Instead of green onions

  • Chives: The same amount, for the green tops. Milder and more delicate, without crunch.
  • Shallot or red onion: Half as much, chopped fine, for the white parts. Stronger; best cooked or soaked in cold water first.
  • Leeks: The same amount, sliced thin. Milder and better cooked than raw.

  More for green onions

Weights from USDA FoodData Central cup weights. Counted things (eggs, cloves, cans) stay as counts, and salt stays in spoons: kosher and flaky salts weigh very differently by brand.

Different pan? Written for 9x13-inch rectangle; rescale the amounts for an 8x8, 9x13, round, loaf or sheet pan.

Cooking for a crowd? Pans, timing and salt for 12 to 50.

Missing something? Tap Swaps next to an ingredient, or see all substitutions.

Cook to 160°F inside (check with a thermometer).