Place water in a large bowl. Add mix and stir together until well-blended. Stir in cheese, pimentos and chopped jalapeños.
Scale batter into 9-inch cast-iron skillets; dividing batter evenly.
Place 5 jalapeño halves in pattern on top of batter.
For convection oven, bake at 350°F 26-32 minutes; for standard oven, bake at 400°F for 28-34 minutes or until toothpick inserted into center comes out clean. Cool completely before cutting.