01 - Preheat oven to 350°F (175°C) and line two large baking sheets with parchment paper.
02 - In a large bowl, cream together the softened butter, granulated sugar, and light brown sugar until light and fluffy.
03 - Blend in creamy peanut butter, then add eggs one at a time, mixing well 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 incorporate the dry mixture into the wet ingredients, mixing until just combined.
06 - Gently fold in chocolate candies, semisweet chocolate chips, and mini pretzels if using.
07 - Scoop rounded tablespoons of dough onto the prepared baking sheets, spacing each portion approximately two inches apart.
08 - Bake for 10 to 12 minutes, or until edges are golden while centers remain soft.
09 - Allow cookies to cool on baking sheets for 5 minutes before transferring to a wire rack to cool completely.