"If the batter thickens as it sits, thin with more club soda...."
INGREDIENTS
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1/2 cup plus 2 tablespoons sugar, divided
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1 1/2 teaspoon ground cinnamon, divided
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Vegetable oil (for frying; about 4 cups)
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1 cup gluten-free old-fashioned oats
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1/2 cup rice flour
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2 tablespoons cornstarch
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1 teaspoon baking powder
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3/4 teaspoons kosher salt
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1 large egg
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1/2 cup (or more) club soda
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2 large crisp apples, peeled, cored with an apple corer, sliced into 1/4"-thick rings