Mashed Potato Chocolate Cake

• 1 cup mashed potatoes, hot and unseasoned
• 1 cup water, lukewarm
• 2 cups all-purpose flour, sifted
• 3/4 cup unsweetened Dutch-processed cocoa powder
• 2 teaspoons instant coffee granules (optional)
• 1/2 teaspoon baking soda
• 1 pinch salt
• 1 cup miniature semisweet chocolate chips (optional)
• 2/3 cup unsalted butter, softened
• 2 cups granulated sugar
• 1 teaspoon vanilla
• 4 large eggs

1. Preheat oven to 350 degrees. Grease and flour a 13 by 9 inch baking pan.
2. Place mashed potatoes into medium bowl. With a whisk, gradually stir in water to form a smooth mixture, do not beat mixture excessively. Cool to lukewarm.
3. Sift flour, cocoa powder, coffee granules, baking soda and salt. Place chocolate chips in small bowl with about 1 Tablespoon of the sifted dry ingredients and stir well until chips are coated. Set aside.
4. In a large bowl, combine butter, sugar and vanilla. Beat 2 minutes at medium speed. Add eggs, 2 at a time, beating in at a low speed until blended. Increase mixer speed to medium; beat 1 minute.
5. At lowest speed, add sifted dry ingredients in 3 additions and mashed potato-water mixture in two additions, beginning and ending with dry ingredients and beating after each addition just until blended. Batter may still appear curdled after all ingredients have ben added -- this is okay. Remove bowl from mixer.
6. Fold in chocolate chips.
7. Turn batter in prepared pan. Bake 27 to 32 minutes. Sift confectioners' sugar over top just before serving.

mashed potatoes, water, flour, cocoa powder, coffee, baking soda, salt, chocolate chips, unsalted butter, sugar, vanilla, eggs

Taken from www.food.com/recipe/mashed-potato-chocolate-cake-342386 (may not work)