Whisk flour, baking powder, and salt together in a bowl. Make a well in the center and add milk and egg. Whisk batter until combined. Fold in blueberries and chia seeds gently.
Heat a nonstick skillet over medium-high heat. Grease the pan lightly with cooking spray. Pour 1/4 cup batter into the hot pan; cook until edges look dry and bubbles on top begin to pop, about 2 minutes. Flip and continue to cook for 1 minute.