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1. Preheat your oven to 350 F and position a rack in the lower third.
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2. Butter and flour (or put parchment down) the bottom of an 8-inch or 9-inch cake pan.
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3. Sift together the flour, cocoa powder, baking soda, and salt onto a piece of parchment paper.
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4. In a bowl, combine the melted butter and brown sugar. Whisk to combine.
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5. Add the eggs one at a time. Add the vanilla and any other flavors you wish. Whisk until smooth.
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6. Making a funnel by picking up the two long ends of parchment paper, add the flour mixture all at once. Stir until the flour mixture is just moist. Do not overblend.
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7. Pour the hot water and buttermilk over the batter and mix into smooth.
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8. Pour the batter into the prepared pan and bake for 30-40 minutes, or until a toothpick comes out clean.
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9. Let cool for about 10 minutes before flipping it out onto a cooling rack. Cool completely.
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10. While the cake is cooling, make your ganache by heating up your cream or milk in a saucepan until scalded and little bubbles are rising on the edge. Likewise you can do this in the microwave, but make sure you do not boil it!
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11. Place your chocolate chips in a bowl and pour the hot milk onto the chips. let them sit for a minute before whisking until smooth. Melt in the butter and salt.
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12. When your cake has completely cooled, pour the warm ganache right on top, smooth the top and let it pour over the sides.