Heat oil in deep fryer or heavy skillet to 375°F.
Slice the jalapeños down the middle and then down the sides so they can be spread open to fill.
In a bowl combine cream cheese and Cheddar cheese.
Fill jalapeños with the cheese mixture and set aside.
In a bowl, combine cornmeal, flour, sugar, salt, pepper and baking powder. Stir in egg and milk.
Transfer corn dog batter to a glass and dip the jalapeño poppers one by one into the batter.
Fry Jalapeño Popper Corn Dogs for 2 minutes or until golden brown.
Drain on paper towels and serve with ranch or your preferred dipping sauce.