Preheat oven to 350°. Stir together the oats, flour, baking soda, baking powder, and salt; set aside.
Put brown and granulated sugars, the butter, and peanut butter in the bowl of an electric mixer fitted with the paddle attachment. Mix on medium speed until pale and fluffy, about 5 minutes. Mix eggs and vanilla, scraping down sides of bowl as needed.
Reduce speed to low. Add oat mixture, and mix until just combined. Mix in peanuts and chocolate chips. Using a small (1 1/2 tablespoon) ice cream scoop, make balls of dough, and place them 2 inches apart on parchment paper-lined baking sheets.
Bake until cookies are golden and just set, 13-15 minutes. Let cool on sheets for 5 minutes. Transfer cookies to wire racks, and let cool completely.
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