Preheat oven to 400 degrees F and grease a 9x9 or 8x8 baking pan with cooking spray.
In a large bowl combine the cornbread mix with the milk and egg.
Mix ingredients until combined. Fold in the diced jalapeño and cheddar cheese.
Transfer batter to greased baking pan. Bake for 16-20 minutes until golden brown or a toothpick comes out clean.
Cool in the pan for about 15 minutes, then cut into equal-sized squares. Serve with your favorite dish, on its own or with a spread of butter and a drizzle of honey. Enjoy!
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Nutritional information is based on third-party calculations and should be considered estimates. Actual nutritional content will vary with brands used, measuring methods, portion sizes and more.