01 - Preheat oven to 350°F and line two large baking sheets with parchment paper.
02 - In a large mixing bowl, beat together unsalted butter, granulated sugar, and brown sugar until the mixture is light and fluffy.
03 - Mix in creamy peanut butter. Add eggs one at a time, beating well after each addition, then incorporate vanilla extract.
04 - In a separate bowl, whisk together old-fashioned oats, all-purpose flour, baking soda, and salt.
05 - Gradually add the dry blend into the wet mixture and mix until just combined.
06 - Gently fold chocolate candies, semisweet chocolate chips, and mini pretzels, if using, into the batter.
07 - Scoop rounded tablespoons of dough onto the prepared baking sheets, spacing each portion two inches apart.
08 - Bake for 10 to 12 minutes, until edges are golden and centers remain soft.
09 - Cool cookies on baking sheets for five minutes, then transfer to a wire rack to cool completely.