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Preheat your oven to 350 degrees and line a square 8" baking pan with parchment paper
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In a saucepan over low heat, combine the unsweetened baking chocolate and almond butter, stirring, until melted and smooth, then remove from heat
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Stir in the sweet potato puree, coconut sugar, and peppermint extract and beat well.
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Beat in the egg and yolk until well incorporated.
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Sift in the the cocoa powder, coconut flour, baking soda and salt (still in the saucepan) until just combined.
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Stir in the chocolate chips and pour the batter into the prepared baking pan and spread evenly. Batter will be lumpy but try to smooth as much as possible.
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Put the pan in the oven and bake for 20-25 minutes, depending on how hot your oven is. Remove from oven and allow to cool in the pan completely before cutting into squares and serving.
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Drizzle melted chocolate on top if desired!