Blueberry Pie is great and all, but so are quick, easy, berry-forward recipes that don’t require you to deal with cold butter in blazing summer heat.
Y’all, I am all about these Blueberry Oat Squares right now. The edges are crisp and buttery with plenty of chewy oats, while the centers are bursting with juicy fresh blueberry filling. They’re super summery and delicious, and a snap to make!
One simple dough doubles as both crust and topping. Just stir six ingredients together in a bowl, then firmly press about half the resulting mixture into the bottom of a square pan. Top it with a layer of simply-spiced blueberry pie filling, then press on the remaining dough. You’ll probably have a few gaps in the topping, but that’s okay—that’s where the jammy filling will peek through. Love that visual and textural diversity.
Once baked and cooled completely, Blueberry Oat Squares can be sliced and served at room temperature or cold. They’re easy to stack and transport, and don’t need to be chilled at all times—this is a perfect picnic dessert if I’ve ever seen one. If you want to get a little fancy, you could even serve them lightly warmed and topped with ice cream and fresh blueberries. But while, in most cases, I identify as “a little fancy,” I’m happy to keep things simple here. For now, at least.
Blueberry Oat Squares
makes one 8- or 9-inch pan, about 16 squares
12 ounces fresh blueberries
1/3 cup granulated sugar
1 tablespoon cornstarch
1/4 teaspoon ground cinnamon
pinch of Kosher or sea salt
2 teaspoons fresh lemon juice (about 1/4 medium lemon)
1 1/4 cup all-purpose flour
3/4 cup light brown sugar, packed
1 teaspoon baking soda
1/2 teaspoon Kosher or sea salt
1 1/2 cups old fashioned oats
3/4 cup (1 1/2 sticks) unsalted butter, melted & cooled slightly
Preheat oven to 350F. Line an 8- or 9-inch square pan with aluminum foil and grease with butter. Set aside.
Make the filling. Combine blueberries, sugar, cornstarch, cinnamon, salt and lemon juice in a medium mixing bowl. Use a silicone spatula or wooden spoon to fold them all together until combined. Set aside.
In a medium mixing bowl, whisk together flour, brown sugar, baking soda, salt, and oats. Use a silicone spatula or wooden spoon to fold in melted butter—mixture may be crumbly, but should hold together when pinched.
Firmly press half the dough (about 2 cups) into an even layer at the bottom of the prepared pan.
Give blueberry filling a stir, then scatter over packed dough (leaving behind any excess liquid), leaving a 1/2-inch border on all sides. Scatter remaining dough mixture over the top. Use the palms of your hands to gently pack it into a even layer, covering the jam.
Bake full pan for 25-27 minutes, or until golden and set on top. Let cool completely in the pan on a rack.
Slice bars with a sharp chef’s knife, wiping the blade clean between cuts. Do not try to slice bars until they are completely room temperature. Serve room temperature, cold, or warmed slightly with ice cream.
Bars will keep in an airtight container in the refrigerator for up to five days. Layer them with wax or parchment paper for best results.