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1
Melt, over hot (not boiling) water, 1/2 cup mint-chocolate chips, stir until smooth.
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2
Cool to room temperature, set aside.
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3
In a large bowl, combine butter and sugar; beat until creamy.
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4
Add egg and vanilla extract, blend well.
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5
Gradually beat in flour and salt.
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6
Place 1 cup of dough in a small bowl.
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7
Add melted chips; blend thoroughly.
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8
Shape into a ball, flatten, (mixture will appear curdled).
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9
Cover with plastic wrap.
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10
Shape remaining dough into ball; flatten.
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11
Cover with plastic wrap.
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12
Chill until firm, about 1 1/2 hours).
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13
Preheat oven to 375 degrees F.
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14
Between sheets of waxed paper, roll each ball of dough into a 13 x 9-inch rectangle.
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15
Remove top layers of waxed paper and invert the chocolate dough onto the plain dough.
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16
Peel off waxed paper.
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17
Starting from the long side, roll up jelly roll stype.
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18
Cut into 1/4-inch slices; place on ungreased cookie sheet.
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19
Bake at 375 degrees F. for 7 to 8 minutes.
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20
Cool completely on wire racks.
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21
Melt over hot, (not boiling), water remaining 1 cup of chips; stir until smooth.
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22
Spread flat side of cookie with 1/2 slightly rounded teaspoonful melted chocolate.
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23
Chill until set.
