To prepare the pancake mix, lightly spoon flours into dry measuring cups; level with a knife. Combine flours and next 4 ingredients (flours through salt) in a large bowl. Store in an airtight container until ready to use.
To prepare the pancake batter, combine the buttermilk and remaining ingredients; add to pancake mix, stirring until smooth.
Spoon about 1/4 cup batter for each pancake onto a hot nonstick griddle or nonstick skillet. Turn the pancakes when the tops are covered with bubbles and the edges look cooked. Cook an additional minute.