Heat a griddle to 300° F or a nonstick pan to medium heat, just slightly cooler than you'd typically cook pancakes at.
Whisk together all of the dry ingredients until well combined. Add the juice of one lemon (careful not to add any lemon seeds when squeezing the juice out, it's not pleasant to bite into one!), vanilla, and 1 ½ c milk and mix until just combined. Batter will be fairly thick.
Let batter rest for 5 minutes to allow chia seeds to gel.
Pour batter onto the hot griddle to make about 8 pancakes. These pancakes won't form the typical bubbles on top. Flip when the bottoms turn a golden brown.