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Preheat oven to 350F. Line 2 baking sheets with parchment paper.
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In the bowl of a stand mixer fitted with a paddle attachment, cream butter, peanut butter, and sugars together until light and fluffy. Beat in eggs and vanilla.
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In a separate bowl, whisk together flour, baking powder, baking soda, and salt. Add this and the oats to the butter mixture and beat until just combined.
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Use a rubber spatula to fold in Rice Krispies, pecans, milk chocolate, and marshmallow bits.
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Drop by rounded tablespoonfuls onto the prepared baking sheet, pressing down slightly.
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Bake 10 - 12 minutes or until golden brown. Cool on baking sheet for a couple minutes befor t