Gluten-Free Onion And Black Pepper Scones

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Ingredients

1 teaspoon olive oil
1 large onion, finely diced
1 cup gluten-free buckwheat flour
1/2 cup sorghum flour
1/2 cup brown rice flour
1 tablespoon baking powder
1 tablespoon granulated sugar
1 teaspoon freshly ground black pepper (reduce to 1/2 teaspoon for less peppery scones)
1/2 teaspoon salt
4 tablespoons cold butter
1 large egg
1/2 cup half and half, plus additional if needed