01 - Preheat oven to 350°F and line two large baking sheets with parchment paper.
02 - In a large bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy using an electric mixer.
03 - Blend in the peanut butter, then add eggs individually, mixing thoroughly after each addition. Stir in vanilla extract.
04 - In a separate bowl, whisk together old-fashioned oats, all-purpose flour, baking soda, and salt until evenly distributed.
05 - Gradually incorporate the dry mixture into the wet mixture, mixing just until combined. Avoid overmixing.
06 - Gently fold in chocolate candies, semisweet chocolate chips, and mini pretzels if using.
07 - Scoop rounded tablespoons of dough and place on prepared baking sheets, spacing each portion two inches apart.
08 - Bake for 10 to 12 minutes or until edges turn golden and centers remain soft.
09 - Allow cookies to cool on baking sheets for 5 minutes before transferring to a wire rack to cool completely.