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Preheat oven to 350°F Spray pots with cooking spray. Put a small piece of parchment paper in the bottom of each pot to cover the hole.
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Whisk together flour, baking soda, baking powder and salt in a medium bowl.
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Stir together boiling water and cocoa in a small bowl.
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Combine butter and sugar and beat with a mixer on medium speed until light and fluffy, 5 to 6 minutes, scraping the bowl once. Add eggs one at a time; beat well after each addition.
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With mixer at low speed, add flour mixture alternating with cocoa mixture, beginning and ending with flour mixture. Scrape bowl occasionally. Batter will be thin.
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Divide batter evenly among pots to about three-quarters full. Line a baking sheet with parchment paper. Place pots on baking sheet and bake 35 to 40 minutes, until cakes are springy to the touch and a toothpick inserted in the center comes out clean and dry. Transfer to wire racks and cool completely in the flowerpots. Frost the top of each with Chocolate Frosting, if desired.
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Note: The cake batter fills two 8-inch layer cake pans, if you prefer. Bake the cake layers 30 to 35 minutes. Cool on wire racks and fill and frost as desired.