Step 1: Prep your dry mix. Grab a large bowl and whisk together the flour, sugar, baking powder, baking soda, and salt. Make sure there are no big clumps.
Step 2: Whisk the wet stuff. In a separate small bowl, lightly beat the egg, then stir in the milk, melted butter, and vanilla.
Step 3: The "Golden Rule." Pour the wet mixture into the dry bowl. Now, listen—do not overmix! Gently stir until just combined. A few small lumps are actually a good thing for extra fluffiness.
Step 4: Heat it up. Set a non-stick skillet over medium heat. Lightly grease it with a tiny bit of butter.
Step 5: Cook & Flip. Pour about ¼ cup of batter for each pancake. Wait for those little bubbles to pop on top and the edges to look set—that’s your cue to flip! Cook until both sides are a beautiful golden brown.