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1
Blend together the butter with the sugar and the vanilla, creaming thoroughly.
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2
Blend in the flour gradually.
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3
Divide the dough into 4 equal parts.
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4
Into one part, add 4 drops of red food color, into a second part, add 4 drops of yellow food color and into a third part, add 4 drops of green, blending very well each color with your hands.
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5
Leave the fourth part without food color.
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6
With your hands, roll down each part of dough in very long strips of about 1/2-inch-thick, placing the strips one along the other, side-by-side on a floured table or board.
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7
With a rolling pin, roll out lengthwise at 1/8-inch thick, making a four-color strip of about 3 inches wide.
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8
Repeat until all the dough is transformed into rainbow strips.
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9
With a round-shape cookie cutter, cut cookies, trying to get a pair number of cookies if you plan to fill them (sandwich style).
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10
Place cookies on a greased baking sheet and cook 8 to 10 min in a preheated oven at 350F Do not brown.
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11
Let cool and fill with the peanut butter filling.
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12
Peanut butter filling:
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13
Place the brown sugar and the flour in a saucepan and add the water.
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14
Cook over medium heat stirring constantly.
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15
When thick, remove from heat and add the peanut butter, then let cool.
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16
Use 1 teaspoon between each pair of cookies.
