In a large bowl, combine flours, oats, baking powder, and salt. Mix well.
In another large bowl, crack egg. Beat lightly with a fork.
Add orange juice, milk, and canola oil to egg.
Coat large skillet with non-stick cooking spray. Heat over medium-high heat.
Add wet ingredients to dry ingredients. Stir just until dry ingredients are moistened. Do not overmix.
Pour ¼ cup batter into hot pan for each pancake. Adjust heat as needed to avoid burning.
Flip pancakes when bubbles appear on top of the batter and the edges are slightly browned, about 3-4 minutes. Cook until second side is slightly browned, about 2-3 minutes more.