Blueberry picnic bars are a delicious option to enjoy at family gatherings, snacks, or simply to take on a walk. Their origin is associated with the American tradition of preparing desserts that are easy to transport and share during outdoor activities, like picnics. In different Latin American countries, these bars may have various names such as "fruit bars," "blueberry tartlets," or simply "homemade energy bars." Regardless of the name, the result is always a sweet treat that combines a crunchy base with a juicy, fruity filling, ideal for any occasion.
In Latin American culinary culture, ingredients like oats and blueberries have been gradually integrated, giving this preparation a healthy and refreshing character. The bars can also be found in versions with local fruits, but the combination of blueberries with a mixture of oats and butter remains a favorite for those looking for a homemade, nutritious dessert with a flavor balanced between sweet and tart.
How to Make Blueberry Picnic Bars
To begin, preheat the oven to 350°F (175°C). Line an 8-inch square pan with aluminum foil, letting the edges overhang on two sides to make it easier to remove later.
In a large bowl, mix the oats, flour, light brown sugar, baking soda, and salt. Add the melted unsalted butter and stir with a fork until the mixture is evenly moistened.
Separate ½ cup of this crumb mixture and set it aside for the topping. With the remaining mixture, press it evenly and firmly onto the bottom of the prepared pan, without greasing it.
Bake the base for 12 minutes so it sets well.
For the filling, in a small saucepan mix the blueberries, sugar, cornstarch, and fresh lemon juice. Cook over medium heat, stirring constantly until it comes to a simmer.
Let it simmer, stirring occasionally, until the juices clear, for about 2 minutes.
Pour this mixture over the baked base and then sprinkle the reserved crumb mixture on top.
Bake everything together for 30 more minutes and then let it cool completely in the pan.
To remove from the pan, lift the aluminum foil by the edges onto a cutting board, remove the foil, and cut the bars into 2-inch squares.
