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Lemon Butter Bars

A lemon and oat pastry crust with a lemon butter filling and topped with toasted coconut. These Lemon Butter Bars are ooey gooey and jammed pack with lemon flavor!
Prep Time10 mins
Cook Time45 mins
Course: Dessert
Cuisine: Dessert Bars
Keyword: Lemon Butter Bars
Servings: 24 squares



  • 1 cup all purpose flour
  • 1 1/4 cups quick cooking oats*
  • zest of 1 lemon
  • juice of 1 lemon
  • 1 cup packed light brown sugar
  • 1/2 teaspoon salt
  • 1 cup unsalted butter melted


  • 1/4 teaspoon salt
  • 1/2 cup all purpose flour
  • 1/4 cup light brown sugar
  • 1 cup sugar
  • 3 large eggs
  • 1/3 cup unsalted butter melted (not hot)
  • 1 teaspoon vanilla extract
  • 1/2 cup evaporated milk
  • 1 tablespoon fresh lemon juice
  • 3 cups sweetened shredded coconut divided
  • zest of 1 lemon



  • Preheat oven to 350 degrees. Line bottom and sides of a 9x13 inch baking pan with parchment paper or aluminum foil.
  • In a large bowl, stir together flour, oats, lemon zest, lemon juice, brown sugar, salt, and melted butter until well combined. Then, press evenly into the bottom of the prepared pan.
  • Bake for 13-15 minutes, or until crust is starting to bubble and brown.


  • While crust is baking, make filling. In a large bowl, whisk together salt, flour, brown sugar, and sugar.
  • In a small bowl, whisk eggs, then stir into flour/sugar mixture. Next stir in vanilla, evaporated milk, lemon juice, and 2 cups of a coconut. Stir until well combined.
  • Pour over crust.
  • In a small bowl, stir together remaining cup of coconut with lemon zest. Sprinkle over filling.
  • Bake for 25 to 30 minutes, or until coconut is golden brown. Let cool completely before cutting into squares.


*You can use old fashioned oats but the bottom will be chewier than it will be with quick cooking oats.