In a small bowl, whisk together the egg, whole milk, and melted butter until combined.
In a large bowl, whisk the all-purpose flour, granulated sugar, baking powder, and sea salt until evenly mixed.
Pour the wet ingredients into the dry ingredients and stir gently until just combined; do not overmix — a few small lumps are fine.
Let the batter rest for at least 5 minutes while you preheat a non-stick skillet or griddle over medium heat (about 190°C / 375°F).
Grease the skillet lightly with butter. Use a ladle or ice cream scoop to pour batter onto the hot skillet, making small circles.
Cook until bubbles form at the edges and the underside is golden, 1–2 minutes, then flip and cook the other side until golden and cooked through.
Repeat with the remaining batter, adding more butter to the pan as needed.
Serve immediately with chocolate sauce or your preferred toppings.