Preheat the oven to 400 degrees F (200 degrees C). Spray a 9x5-inch baking pan with cooking spray.
Beat 1/2 cup soy milk, sugar, vegetable shortening, salt, and vanilla extract together in a large bowl until well blended.
Mix flour, cornmeal, and baking powder together in a bowl. Stir flour mixture into sugar mixture, alternating with the remaining 1 cup soy milk. Beat until well blended. Pour batter into the prepared pan.
Bake in the preheated oven until a toothpick inserted in the center comes out clean, 30 to 35 minutes.