Apple-Cinnamon-Walnut Skillet Cake

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1/2 cup high-oleic sunflower oil or canola oil, plus extra for the pan

1 cup brown rice or sorghum flour

1 cup buckwheat flour

1 tablespoon plus 1 teaspoon baking powder

1 tablespoon plus 1 teaspoon flax meal

2 teaspoons ground cinnamon 

1/2 teaspoon baking soda

1/4 teaspoon salt

1/2 cup pure maple syrup

1/3 cup sparkling water or unsweetened dairy-free milk

1 teaspoon pure vanilla extract

2 large apples 

1 cup chopped walnuts