- Preheat your oven to 350°F (175°C).
- In a large bowl, beat the egg whites until foamy, then add the cream of tartar and salt, continuing to beat until soft peaks form.
- Gradually add the sugar, beating until stiff peaks form.
- Gently fold in the gluten-free flour and vanilla extract until just combined.
- Carefully fold in the fresh raspberries.
- Pour the batter into an ungreased angel food cake pan and smooth the top.
- Bake for 30-35 minutes or until the cake is golden and springs back when touched.
- Invert the pan to cool completely before removing the cake.
- Serve with additional raspberries if desired.
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