Position rack in bottom third of oven and preheat to 400° F (200° C).

Lightly mist a 9 x 13 inch pan with cooking oil spray.

In a large bowl, whisk together dry ingredients, blend well.

In a separate bowl, whisk eggs, buttermilk, oil, and cilantro. Add to flour mixture. Stir to combine.

Add jalapenos, peppers, corn and cheese, if using. Stir and spoon into pan. Spread out to cover pan.

Bake for approximately 18-20 minutes until beginning to brown on edges and toothpick inserted comes out clean.

Transfer to rack to cool. Cut into squares. Extras can be frozen or stored in fridge. Quickly reheating in the microwave will ensure they are soft for eating.