Heat oven to 350ºF (180ºC). Grease and line with parchment paper an 8″ (20 cm) square baking pan.
Mix cornmeal, flour, baking powder and salt in small mixing bowl.
Blend sour cream, eggs and oil in medium mixing bowl. Add cornmeal mixture, 1 1/2 C. (375 mL) cheddar cheese, corn and chilies. Mix well. Pour into prepared pan. Sprinkle with remaining 1/2 C. (125 mL) cheddar cheese.
Bake for 30 to 35 minutes, or until wooden toothpick inserted in centre comes out clean. Cut into squares and serve warm.