In a separate bowl, sift together with a whisk the all-purpose flour, rolled oats, salt, baking soda, baking powder, cinnamon, ginger, nutmeg, and cardamom. This is important to make sure your ingredients are evenly distributed.
2 1/2 (300g) cups all-purpose flour, 1 2/3 (150g) cups rolled oats, 1 tsp sea salt, 1 tsp baking soda, 1 tsp baking powder, 1 tbsp ground cinnamon, 1 tsp ground ginger, 1 tsp ground nutmeg, 1/4 tsp ground cardamom