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1
Preheat oven to 350u00b0F. Lightly grease 18 cups in a regular size muffin tin and set aside.
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2
For the peanut butter dough:
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3
In a large bowl, or the bowl of a stand mixer, whisk together the melted butter, egg, brown sugar, granulated sugar, peanut butter and vanilla until combined. Add the flour, baking soda and salt and mix until just combined. Don't overmix. Stir in the chocolate chips.
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4
For the brownie dough:
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5
In the bowl of a stand mixer, or with an electric mixer, cream together the butter, sugar, brown sugar and vanilla until light and fluffy. Add the eggs and mix again until well combined. Whisk together the flour, cocoa powder, salt and baking soda. Add the dry ingredients to the butter mixture and mix until well combined. Mix in the chocolate chips.
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6
Divide both the peanut butter dough and the brownie dough into 18 pieces (about 1 tablespoon brownie dough and 1 1/2 tablespoons peanut butter dough for each cup-there is more peanut butter dough, it's okay, they're terrific that way!) and roll each piece of dough into a ball. Press one ball of each dough into the prepared muffins cups. Bake for 9-12 minutes until the tops are just set and the edges are starting to brown, do not over-bake.
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7
Let the brookie cups cool completely before removing them from the muffin tins. Store in an airtight container at room temperature for up to 5 days, or freeze for up to 3 months.
