In a medium bowl, whisk together the flour, cornmeal, baking powder, sugar and salt. In a small bowl or measuring cup, use a fork to lightly beat the milk, melted butter and egg. Pour the milk mixture over the flour mixture. Add the corn and jalapeno. Use a fork to stir until just mixed and there are no visible traces of flour.
Heat a 10-inch skillet over medium-low heat. Sprinkle a few drops of water into the skillet--if they "dance" across it, the skillet is ready. Add a pat of butter and swirl to coat. Drop scant 1/4 cupfuls of batter into the skillet, leaving 1 to 2 inches between each cake. Cook until set around the edges and air bubbles form on top, about 2 minutes. Flip and cook 1 to 2 more minutes. Serve hot.
Love Your Leftovers: Store remaining griddle cakes in a ziptop bag in the fridge for up to 2 days, or the freezer for up to 1 month. Heat them in a toaster (no need to thaw frozen ones) when ready to eat.
Recipe courtesy of Jennifer Perillo