Preheat the oven to 350°F.
Line a 9x9-inch baking pan with parchment paper or foil; set aside.
In a large bowl, stir together flour, 1 cup cooked quinoa, baking soda and salt until combined, breaking up any lumps of quinoa, if needed.
In a second bowl, whisk together buttermilk and eggs, add to flour mixture and stir just until combined.
Transfer batter to prepared pan, spread out evenly and then scatter remaining 1/4 cup quinoa over the top.
Bake until cooked through and golden brown around the edges, about 30 minutes.
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