Ingredients

• 1 cup (80g) quick-cooking oats
• 1 ½ cups (180g) all-purpose flour
• 1 cup (200g) packed light brown sugar
• ¼ teaspoon baking soda
• ¼ teaspoon baking powder
• ¾ cup (1 ½ sticks / 170g) unsalted butter, melted

• 1 can (14 ounces) sweetened condensed milk
• ½ cup (115g) freshly squeezed lemon juice (about 3 lemons)
• 2 large egg yolks
• 1 teaspoon lemon zest
• ⅛ teaspoon kosher salt

Instructions

1. Preheat Oven & Prepare Pan:
   Preheat your oven to 350°F (175°C) and line a 9x9-inch baking pan with parchment paper. Set aside.
2. Make the Oat Crust:
   In a large bowl, mix together oats, flour, brown sugar, baking soda, and baking powder. Pour the melted butter over the dry ingredients and stir until it forms a crumbly texture. Be careful not to overmix.
3. Reserve the Crust Mixture:
   Take about half of the oat mixture (roughly 2 cups) and set it aside for the topping.
4. Prepare the Bottom Layer:
   Press the remaining oat mixture into the bottom of the prepared pan, creating an even layer. Bake in the preheated oven for 12-15 minutes, or until golden brown. Remove from the oven and let it cool slightly while preparing the lemon filling.
5. Make the Lemon Filling:
   In a large bowl, combine the sweetened condensed milk, lemon juice, egg yolks, lemon zest, and kosher salt. Stir until smooth and creamy.
6. Assemble the Bars:
   Pour the lemon filling over the slightly cooled oat crust. Evenly sprinkle the reserved oat mixture on top of the lemon filling.
7. Bake:
   Bake the bars for 20-25 minutes, or until the edges are golden brown. Let them cool to room temperature, then refrigerate for at least 1 hour before serving.