1. Preheat the oven to 350 degrees.
2. Mix together the sugar and the oil. Beat in the eggs and vanilla. Sift together the unbleached flour, soy flour, baking powder, salt, and carob powder.
3. Combine the egg mixture with the sifted dry ingredients. Mix well. Pour into a well-buttered 9-inch square baking pan and bake for about 30 minutes, or until done. Cut into squares or bars while still slightly warm.