In a large mixing bowl, combine all the ingredients EXCEPT the apples. Stir until just combined.
1 ¾ cup (210 g) gluten-free flour blend, 1 cup (240 ml) whole milk, ¾ cup (150 g) granulated sugar, ½ cup (113 g) unsalted butter, 2 large eggs, 2 teaspoons baking powder, 1 teaspoon pure vanilla extract, ½ teaspoon salt, ½ teaspoon ground cinnamon, ¼ teaspoon ground nutmeg, ¼ teaspoon baking soda