Combine buttermilk and rolled oats in a small bowl; let stand for 20 to 30 minutes to soften oats.
Stir together flours, wheat germ, brown sugar, baking powder, baking soda, cinnamon and salt in a medium bowl. Mix together egg, egg whites and 1 teaspoon oil in another bowl with a whisk or fork. Add the oat mixture and the flour mixture and stir with a wooden spoon until just combined.
Lightly brush a large nonstick skillet with a little of the remaining 1 teaspoon oil and place over medium heat. Using 1/4 cup batter for each pancake, pour batter onto the pan and cook until the underside is browned and the bubbles on top remain open, 2 to 3 minutes. Turn the pancakes over and cook until the underside is browned, about 1 to 2 minutes. Transfer to a platter and keep warm in a 200°F oven. Repeat with remaining batter, brushing the pan with a little of the remaining oil as needed. Serve hot, topping with maple syrup if desired.