In a large bowl, whisk together eggs, olive oil, sugar, buttermilk and vanilla until smooth. Stir in zucchini.
In a smaller bowl, combine flours, salt, baking soda, baking powder, and cinnamon. Stir dry ingredients into zucchini batter, mixing until just combined. Don't overmix!
If not serving pancakes immediately, prep baking sheet with two pieces of foil to store and keep cooked pancakes covered and warm.
Heat a large, heavy skillet over medium heat. Once hot, melt a pat of butter in pan and swirl it around until it sizzles.
Scoop ¼-cup dollops of batter into pan. Cook until bubbles appear on the surface, about 2 to 3 minutes. Flip pancakes and cook another minute or two, until golden underneath.
Transfer pancakes to prepared baking sheet to keep warm. Repeat with remaining batter.
To make maple yogurt: In a small bowl, whisk together yogurt, maple syrup, and nutmeg. Serve with pancakes.