Preheat oven to 350 degrees. Line a 9x13 baking dish with aluminum foil.
1/2 cup shortening
1/2 cup unsalted butter
Melt butter and add in shortening, sugars, eggs and vanilla.
1/2 cup brown sugar
1&1/8 cup granulated sugar
2 teaspoons vanilla
Add in flour, powder, cream of tartar and salt.
2 1/4 cups all-purpose flour
2 teaspoons baking powder
1/2 teaspoon cream of tartar
1/2 teaspoon salt
Spread batter on the aluminum foil lined pan.
Bake for 30 minutes until toothpick comes out clean.
Immediately sprinkle with the combined sugar and cinnamon and let cool before removing from pan and foil.
1/8 cup granulated sugar
1 teaspoon cinnamon
Cut into bars. Soft and delicious!