Buffalo Chip Cookies

1 cup margarine
1 cup brown sugar
1 cup granulated sugar
2 eggs beaten
1 teaspoon vanilla
1 cup oatmeal
2 cups flour
1 teaspoon baking soda
1 teaspoon baking powder
1 12 ounce pkg. chocolate chips
1 cup chopped nuts
1 cup cornflakes

Mix all together and bake at 350 for 12 minutes. These freeze well.