01 - Preheat oven to 350°F and line two large baking sheets with parchment paper.
02 - In a large bowl, beat together softened butter, granulated sugar, and light brown sugar using an electric mixer until mixture is light and fluffy.
03 - Add creamy peanut butter and beat to combine. Add eggs one at a time, 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 blended.
05 - Gradually add dry ingredients to wet mixture, stirring just until incorporated without over-mixing.
06 - Gently fold in chocolate candies, semisweet chocolate chips, and crushed mini pretzels if using.
07 - Scoop rounded tablespoons of dough onto prepared baking sheets, spacing each about two inches apart.
08 - Bake in preheated oven for 10 to 12 minutes until edges are golden and centers remain soft.
09 - Let cookies cool on the baking sheets for five minutes before transferring them to a wire rack to cool fully.