Add yogurt, milk, eggs, flour, flax meal, protein powder (if using), maple syrup (if using), baking powder, baking soda, cinnamon, nutmeg, salt, and vanilla extract to mixing bowl and stir until uniform with no dry pockets.
2 cups Greek yogurt, ½ cup milk, 2 eggs, 1 cup all-purpose flour, ¼ cup flax meal, 4 tablespoons protein powder, 2 tablespoons maple syrup, 1 tablespoon baking powder, ½ teaspoon baking soda, 1 teaspoon ground cinnamon, ½ teaspoon ground nutmeg, ½ teaspoon fine sea salt, 1 teaspoon vanilla extract