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(If using a box mix, skip these instructions and follow the ones on the back of the box)
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Preheat oven to 350. Grease an 8x8 baking pan.
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Over a double broiler, or in the microwave, melt butter and chocolate together. Once melted, allow to cool about 10 minutes.
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Next, add in the sugar, and mix. Add in eggs, one at a time, stirring after each addition. Next, add in vanilla.
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Add in espresso powder, salt, baking powder, flour, and cocoa powder. Mix until just combined.
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Add in oil and chocolate chips, stir.
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Pour into pan, and bake for 25-30 minutes, or until brownies are no longer wet in the middle.
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Allow to cool before using a heart-shaped cookie cutter to cut the brownies into hearts (I found that allowing the brownies to chill in the fridge for 60 minutes makes cutting into them easier). Using a medium-sized cookie cutter, I was able to get 9 brownie hearts (if you use a smaller one, you may be able to get 12).