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1
Place the butter and sugar in a large bowl and stir until smooth.
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2
Add the eggs and vanilla and stir well.
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3
Add the flour, baking powder, and salt and stir until completely incorporated.
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4
Place a 2-foot-long piece of plastic wrap on a flat surface.
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5
Spread half of the dough down the center of the plastic to form an 18-inch-long, 2-inch-wide rectangle.
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6
Set the other half of the dough aside.
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7
Place the chocolate chips in a small saucepan and cook over low heat, stirring constantly, for 3 to 4 minutes, until the chocolate is melted.
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8
(Alternatively, if you have a microwave, place the chocolate chips in a small microwave-safe bowl and microwave on high heat for 30 seconds, then stir.
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9
If the chocolate is not all melted, place it back in the microwave for 15 seconds at a time, stirring after each time, until it is completely melted.)
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10
Stir the melted chocolate into the remaining dough and spread evenly over the white dough.
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11
Fold the excess plastic wrap over the dough and smooth with your hands to form a 1 1/2- to 2-inch-diameter log.
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12
Lift up the excess plastic wrap and use it to roll the log to one edge of the wrap.
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13
Tightly wrap the log in the plastic wrap and refrigerate for 30 minutes.
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14
Preheat the oven to 400F.
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15
Remove the plastic wrap from the roll and cut into 1/4-inch-thick slices.
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16
Arrange the slices on a baking sheet about 2 inches apart and bake for 10 to 12 minutes, until lightly browned.
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17
Cool on parchment or waxed paper.
