Beat the shortening sugar and vanilla with whisk attachment
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combine the dry ingredients in a separate bowl and whisk. combine wet ingredients in another bowl and whisk
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add half the wet ingredients to the shortening mixture and use paddle attachment to mix , then add half of dry ingredients keep stirring. add the rest of the wet , then the rest of the dry. blend until just combined
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Grease sides of a 18x26 sheet pan, lay down a piece of parchment then grease the parchment. Pour the batter into the pan and smooth until very even and has no bumps. Bake in a 340 oven 24 minutes