Lemon Oat Squares Recipe

5 / 5 (1 review) 2 Comments

oat lemon squares

A yummy whole grain crust and topping with a sweet/tart lemon filling. I think the crust balances the filling quite nicely. My sister-in-law, who is not usually a fan of lemony things, tried one and loved it! She also took home a plate of them and wanted the recipe. 😉 Some lemon-lovers may want a thicker filling. So, I think I would try making it in an 8×8 or 9×9 pan in that case, it may need more baking time though.

Recipe from King Arthur Flour Whole Grain Baking

lemon oat squares

A few of the tools I like to use when I’m dealing with zest and fresh juicing…

zest nestlemon squeezer

More Lemony Recipes:

Lemon Oat Squares Recipe

5 / 5 (1 review)
Prep Time: 15 min | Cook Time: 35-40 mins
Yield: 9 x 13 cake | Serves: 12


  • Crust:
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  • 1/2 cup unsalted butter, room temperature
  • 1 cup packed light or dark brown sugar
  • 1 tsp baking powder
  • 1/2 tsp salt
  • 1 cup old-fashioned rolled oats
  • 2/3 cup old-fashioned rolled oats, ground for 30 seconds in a food processor
  • 3/4 cup whole wheat flour
  • 2 Tbsp orange juice
  • Filling:
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  • 1 can (14 oz) sweetened condensed milk
  • 1-2 Tbsp finely grated lemon zest
  • 1/2 cup freshly squeezed lemon juice


  1. Preheat oven to 350.
  2. Lightly grease a 9x13-inch pan.
  3. To prepare the crust: Beat the butter, sugar, baking powder and salt in a medium mixing bowl until smooth.
  4. Add the rolled oats, ground oats, flour and orange juice, mixing to combine.
  5. The mixture will start to clump; as soon as it starts to look cohesive, stop mixing.
  6. Sprinkle half of the mixture (about 2 generous cups) into the prepared pan.
  7. Press it into the bottom of the pan, patting the crumbs firmly to make a smooth layer.
  8. To prepare the filling: Whisk the condensed milk, lemon zest and lemon juice in a small bowl, stirring until smooth and thickened.
  9. Spread the filling over the crust in the pan.
  10. Sprinkle the remaining crust mixture evenly on top of the filling.
  11. Bake until light, golden brown, 35-40 minutes.
  12. Remove from oven and set on a rack to cool.
  13. After about 10 minutes, loosen the edges of the squares with a knife.
  14. Refrigerate overnight, covered, before cutting and serving.
Ingredients: Lemon, Oats
Meal Type: Desserts, Easter, Spring, Summer, Meatless
Categories: Brownies and Bars, Oven

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