Method
1. Pre-heat oven - 200°C / 400°F, middle rack
2. In a large bowl, combine the flour, cornmeal sugar, baking powder, and salt
3. Stir the diced jalapeño and shredded cheddar into the flour mixture until evenly combined
4. In a separate bowl, whisk together the sour cream, milk, eggs, and oil
5. Pour the wet ingredients into the bowl with the dry ingredients and stir just until everything is moist
6. Grease a clean medium cast iron skillet
7. Pour the batter into the prepared baking dish and spread it out evenly
8. Top with the sliced jalapeños and the remaining shredded cheddar
9. Bake the cornbread for about 35 minutes, or until the center has puffed up and the edges are golden brown