Combine flours, milk powder, baking powder, salt and soda in 1-gallon freezer resealable plastic food storage bag. Stir mixture with wire whisk to blend. Seal bag and shake upside down to mix ingredients in corners. Alternatively, mix ingredients together in a large mixing bowl with a wire whisk and spoon into an 8-cup container with a tight-fitting lid. Seal container. Label and date contents. Store in freezer. Use within 6 months.
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Note- Freezing is suggested for the baking mix because whole wheat and oat flours are made with whole grains, meaning they still contain the bran, the germ and the endosperm of the grain. Whole grains contain more beneficial fats and fiber than refined grains, and should be frozen for longer shelf life.
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