To prepare a whole wheat carrot pineapple cake recipe, first you need to prepare the cake batter. First, you'll need: 1 cup (240 g) of whole grain flour, 1 tablespoon (15 ml) baking powder, and 2 tablespoons (14. fl oz) granulated sugar. Then, add the wet ingredients to the dry ingredients and mix until the ingredients are well combined. Pour the batter into the prepared cake pan and bake for 35 to 40 minutes at 325 degrees Fahrenheit (180 degrees Celsius) or until toothpick inserted in the center comes out clean. Let cool for 5 minutes before slicing into squares.