Add the dry ingredients except the blueberries to a large bowl. Whisk together the dry ingredients until they are well combined.
Add the wet ingredients to the dry ingredients including the Greek yogurt or Skyr, eggs, milk, honey, lemon juice, and vanilla extract. Stir to combine and then fold in the blueberries (if using). If the batter is too thick, thin it out with a bit more milk. If it's too thin, let it set for a couple of minutes.
Heat a nonstick large skillet or griddle on medium heat. Add a drop of cold water and once it sizzles, lower the heat to medium-low and let it cool 1-2 minutes. Spray your pan with cooking spray or coat in butter and add about ¼ cup of the pancake batter at a time to the skillet. If you want, smooth out the batter a bit with the bottom of your measuring cup.
Let the pancakes heat until bubble begin to appear on the top and the edges start to look dry, about 3-4 minutes. Flip the pancakes and let them cook for another 1-2 minutes until golden brown. Repeat with the rest of the batter. The mix will make about 15 pancakes total.
Hint: you can make these pancakes with oatmeal in the blender instead of oat flour. If using oatmeal, blend the oats for about 30 seconds-1 minute. Then, add the remaining ingredients (except the blueberries) and blend until smooth, pushing down the sides as needed. Stir in the blueberries and then follow steps 3-4.