Classic Lemon Bars with Shortbread Crust

• Crust
• 1 cup all-purpose flour, spooned and leveled (125 g)
  Swaps for all-purpose flour

  Instead of all-purpose flour

  • Gluten-free 1:1 baking flour: The same amount, a blend that includes xanthan gum. A little grittier and more crumbly, browns faster and dries out sooner.
  • Bread flour: The same amount. More gluten: chewier cookies and bread, tougher cakes.
  • Whole wheat flour: Up to half of the flour. Nuttier, darker and denser.

  All 4 swaps for all-purpose flour

  Cooking for an allergy? Check every label.

• ¼ cup powdered sugar, 30 g
  Swaps for powdered sugar

  Instead of powdered sugar

  • Homemade powdered sugar: 1 cup granulated sugar + 1 tbsp cornstarch, blended. Slightly grainier in uncooked frosting; fine in glazes and for dusting.

  More for powdered sugar

• ¼ 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 cup unsalted butter, melted (113 g)
  Swaps for unsalted butter

  Instead of butter

  • Salted butter: The same amount, with about ¼ tsp less salt per stick (½ cup) elsewhere in the recipe. Nothing noticeable once you cut the salt.
  • Plant-based butter sticks: The same amount. The closest swap.
  • Refined coconut oil: The same amount: solid when the butter is soft or cold, melted when it is melted. It is all fat, so bakes are a bit more tender and rich, with no butter flavor.

  All 4 swaps for butter

  Cooking for an allergy? Check every label.

• Lemon layer
• 1 cup granulated sugar, 200 g
  Swaps for granulated sugar

  Instead of sugar

  • Less sugar: Up to ¼ less in cookies, muffins and quick breads. Less browning and spread, a drier, more cake-like texture, and bakes go stale sooner.
  • Brown sugar: The same amount, packed. Moister and chewier, with a caramel flavor and darker color.
  • Coconut sugar: The same amount. Darker and caramel-like, a little less sweet; cookies spread slightly less.

  All 4 swaps for sugar

• 3 tbsp all-purpose flour
  Swaps for all-purpose flour

  Instead of all-purpose flour

  • Gluten-free 1:1 baking flour: The same amount, a blend that includes xanthan gum. A little grittier and more crumbly, browns faster and dries out sooner.
  • Bread flour: The same amount. More gluten: chewier cookies and bread, tougher cakes.
  • Whole wheat flour: Up to half of the flour. Nuttier, darker and denser.

  All 4 swaps for all-purpose flour

  Cooking for an allergy? Check every label.

• 1 pinch salt
  Swaps for salt

  Instead of salt

  • Kosher salt: About twice as much Diamond Crystal, or about 1¼ times as much Morton. 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

• 3 large eggs, room temperature
  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.

• 1 tbsp lemon zest, from about 2 lemons
  Swaps for lemon zest

  Instead of citrus zest

  • Another citrus zest: The same amount. A different citrus aroma; any of them brightens a dish.
  • Dried citrus peel: 1 tsp dried for each 1 tbsp fresh zest. Milder and a little bitter.
  • Lemon or orange extract: About ¼ tsp extract for each 1 tsp zest, to taste. Strong citrus flavor, no texture.

  More for citrus zest

• ½ cup lemon juice, fresh, from 3 to 4 lemons (120 ml)
  Swaps for lemon juice

  Instead of lemon juice

  • Lime juice: The same amount. A different, more floral aroma; works almost everywhere.
  • Bottled lemon juice: The same amount. More sour and flatter; fine in cooking and baking, less bright in dressings and drinks.
  • White wine vinegar or white vinegar: Half as much. Sharper, with no citrus aroma.

  More for lemon juice

• Topping
• 2 tbsp powdered sugar, for dusting
  Swaps for powdered sugar

  Instead of powdered sugar

  • Homemade powdered sugar: 1 cup granulated sugar + 1 tbsp cornstarch, blended. Slightly grainier in uncooked frosting; fine in glazes and for dusting.

  More for powdered sugar

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 8x8-inch square; 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.