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Preheat oven to 350 degrees F. Line baking sheets with parchment paper.
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Combine and whisk the flour, baking soda, and salt in a bowl. Set aside.
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Beat the butter and peanut butter together on medium speed until fluffy, or about 1 minute (I like to use the paddle attachment on my mixer).
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Add both sugars and beat on medium speed until combined (about 30 seconds).
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Add the eggs one at a time and beat until smooth each time.
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Add vanilla and beat until smooth.
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Using LOW speed, slowly pour the flour mixture in until combined.
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Stir in peanuts until combined.
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Using a large cookie scoop drop the dough onto prepared baking sheets (I like these to be the size of a large golf ball). Leave at least 2 inches in between each cookie (I do 6 per sheet).
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Bake for 12 to 14 minutes, or until the cookies are golden around the edges but still soft. Remove from oven and let them cool on the baking sheets for about 10 minutes, and then transfer cookies to a cooling rack to cool completely.
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Pour yourself a glass of milk and ENJOY!