1Preheat your oven to 400°F (200°C). Grease a 9-inch square baking pan.
In a large bowl, combine the cornmeal, all-purpose flour, sugar, baking powder, and salt.
In another bowl, whisk together the milk, vegetable oil, and eggs until well combined.
Pour the wet ingredients into the dry ingredients and stir until just combined.
Fold in the shredded cheddar cheese and diced jalapeños.
Pour the batter into the prepared baking pan and spread it out evenly.
Bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean.
Allow the cornbread to cool in the pan for a few minutes before slicing and serving.