01 -
Preheat oven to 350°F and line an 8-inch square baking pan with parchment paper.
02 -
Whisk together flour, oats, baking soda, salt, and cinnamon in a medium bowl. In a large bowl, combine melted butter, brown sugar, granulated sugar, and vanilla until well incorporated. Add dry ingredients and fold in until fully combined.
03 -
Reserve 220 g of dough for topping (keep chilled until needed). Press remaining dough evenly into the bottom of the prepared baking pan.
04 -
Bake crust for 14 to 16 minutes, until lightly golden and set. Transfer to a wire rack and cool for 15 minutes.
05 -
Combine raspberries, sugar, salt, cornstarch, and lemon juice in a heavy saucepan over medium-high heat. Bring to a boil, pressing firmly on berries to release juices, about 3 to 4 minutes. Reduce heat to low and simmer for 1 to 2 minutes, until filling is thickened and coats the back of a spoon. Remove from heat and cool for 10 minutes.
06 -
Spoon raspberry filling evenly over the cooled crust. Crumble the reserved dough over the filling to create a textured topping.
07 -
Bake for 40 to 42 minutes, or until topping is golden and filling is slightly bubbly. Cool completely in pan on a wire rack.
08 -
Just before cutting, chill in the freezer for 15 minutes. Carefully lift parchment and place bars on a cutting board; cut into squares with a sharp knife.