Combine first 4 ingredients in a bowl; let stand 10 minutes. Add egg, and beat well.
Lightly spoon flours into dry measuring cups; level with a knife. Combine flours, baking powder, and salt; stir with a whisk. Add oat mixture to flour mixture; stir until blended.
Spoon about 1/4 cup batter onto a hot nonstick griddle or nonstick skillet coated with cooking spray. Turn pancakes when tops are covered with bubbles and edges look cooked.