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1
Preheat oven to 350 degrees F.
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2
Grease cookie sheets using preferred method.
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3
In a medium sized mixing bowl, sift together 2 1/2 cups flour, baking soda and salt.
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4
In a large mixing bowl, using a mixer on medium speed, beat together butter, peanut butter, sugar and granulated sugar until creamy, about 2 minutes.
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5
Beat in eggs and vanilla until well combined.
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6
Reduce mixer speed to low and gradually beat in flour mixture until combined.
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7
Divide dough into two bowls.
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8
In one bowl, beat in additional 1/4 cup flour until combined; stir in 1/2 cup M&M's.
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9
In additional bowl, beat in cocoa powder until combined; stir in 1/2 cup M&M's.
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10
Lightly cover dough and chill in the refrigerator or freezer until firm, about 15 minutes.
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11
Form dough into two balls, shape into logs, and wrap in separate pieces of plastic wrap; chill for 10 minutes.
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12
Place additional 1/2 cup peanut M&M's in a plastic bag and crush with a rolling pin.
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13
Remove cookie dough logs from freezer, press together, and roll into crushed M&M's to coat the outside.
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14
Cut log in half, wrap logs in plastic wrap, and chill for 10 additional minutes.
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15
Slice logs into 1/2-inch thick rounds, place on cookie sheets, and bake for 14-15 minutes, or until golden brown around edges.
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16
Cool 1 minute before transferring to wire racks to cool completely.
