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3/4 cup half-and-half
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1 tablespoon unsalted butter
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1/2 pound semisweet chocolate chips
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1/4 teaspoon pure vanilla extract
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Scald the half-and-half and butter in a small, heavy saucepan over moderate heat. Remove from the heat. Place the chocolate and vanilla in a medium heatproof bowl. Add the hot half-and-half and let sit for 2 minutes, then whisk until smooth. Serve slightly warm.
Make Ahead
The sauce can be refrigerated in an airtight container for up to 3 days; rewarm gently.