- Preheat the oven to 350°F (175°C) and grease a 9×9 inch baking pan.
- In a bowl, mix the gluten-free flour, oats, brown sugar, and melted butter until crumbly.
- Press half of the mixture into the bottom of the prepared pan to form the crust.
- In another bowl, combine the raspberries, granulated sugar, and cornstarch, then pour over the crust.
- Sprinkle the remaining crumb mixture over the raspberry layer.
- Bake for 30-35 minutes or until the top is golden brown.
- Allow to cool before cutting into bars.
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