Sift flour, cornmeal, sugar, baking powder, baking soda and salt together in a large bowl. Combine buttermilk, Cheddar, Monterey Jack, jalapenos, green onions, egg, cilantro and melted butter in a medium bowl. Fold wet ingredients into dry ingredients with a rubber spatula until just combined. (Do not overmix.)
Spray a muffin tin with cooking spray. Evenly fill 6 muffin cups to the top. Bake for 20 minutes.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.