Let the butter sit at room temperature for several hous,or soften it in the microwave at HIGH for 10 to 20 seconds (do not melt).
Makes about 2 dozen
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1 cup all-purpose flour
1 cup firmly packed dark brown sugar
1 large egg
1/2 cup butter, softened
1 teaspoon vanilla extract
1 cup semisweet chocolate morsels
Stir together all ingredients in a large bowl, blending well. Drop cookie dough by tablespoonfuls onto ungreased baking sheets.
Bake at 350º for 13 to 15 minutes. Cool on baking sheets 1 minute; remove cookies to wire racks to cool completely.