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Preheat oven to 350°F and grease a 9×13 inch baking dish.
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Cream together the shortening and sugar until light and fluffy.
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Add eggs, one at a time, scraping down the sides between additions.
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Mix in sour cream.
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Combine flour, baking powder, baking soda, salt, and cream of tartar in a separate bowl.
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Add to shortening mixture by the half cup.
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In a small bowl, combine sugar and cinnamon.
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Sprinkle half the cinnamon/sugar mixture in the bottom of your greased dish.
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Spread the batter on top.
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Top with the remaining sugar mixture.
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Bake for 25-30 minutes. {When you think it’s done, stick a toothpick in it and if it comes out clean, you’re good to go!}